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• mac + parallels and https site test = router restarts

  - by Erik

  Ok I have an interesting & very frustrating problem happening. I'm going to explain it the best I can. I work as a graphic designer & web designer on a mac and have a Comcast internet connection that comes through a Comcast branded router (SMC8014) which then ties into an Airport Extreme Base Station which runs my office network. I run OS 10.5.7 and also run Parallels 4.0.3 (running Windows XP) for testing websites in Internet Explorer and so on. Ok, so that the basic background. Here's my issue. I've been collaborating an ecommerce website with another designer/developer and when testing the site on the PC side we have started to run into some sort of network problem. The site is https if that matters at all I suspect it may. Basically when I run parallels for testing I am constantly having to restart the router in order to connect to the test site (it's hosted). Funny thing is I can access the rest of the internet fine, just not this site I'm working on until I restart the router (It's sorta like the site is timing out). This never happens when just running the Mac side of things. It only becomes an issue when Parallels is open and I am doing page refreshes while making css or HTML edits via something like Coda or CSS edit (connected to the hosting server via ftp). The real problem is that once the problem starts I only get about 2 or 3 page loads before I have to restart the router again. It's absolutely crippling. I cannot get any work done when I have to restart the router every couple of minutes. So, if you think this problem is isolated to me, the answer is no. The designer/developer I'm collaborating with has an office a couple miles away and experiences very similar problems under slightly different setup. He also has Comcast as his internet provider and connects his router to an Airport and primarily works on a mac. The main difference is that rather than using a visualizer like parallels to test the website on the PC he uses a real live PC that is on his network. Once he fire up the PC to do testing he runs into the same issue described above. After a couple of page refreshes in Internet Explorer or other browser on the PC the site becomes unresponsive and the router has to get restarted. Any thoughts on what is going on here would be greatly appreciated. Thanks in advance.

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• Cannot connect to WEBrick on home network

  - by Chris Stewart

  I'm an Android developer and often my applications require server-side code. I typically use Ruby on Rails for the web app, and during development will run the server on my local machine (Mac OS X) with WEBrick. In the morning when I get to the office, I'll run ifconfig in the console to see what IP my laptop has been given that day. I'll use that IP in my Android app when making requests to the web app in question. This all works fine, when I'm in my office. When I get home, I attempt to do the same thing, find my laptop's IP via ifconfig, set it in my app's config file, but the destination can never be found. To exclude my app from the set of hurdles, I attempt to visit the web server IP (e.g., http://192.168.1.4:3000) from my phone's browser, and it cannot connect. If I try from my laptop, which is running the web server, it works fine. If I try from another machine, on the same network, it also is unable to connect. Given this, I think I've narrowed it down to some kind of configuration in my home network, but I frankly have no idea what the cause could be. I don't have anything special at home, your basic Verizon FiOS router/modem with everything connected via Wi-Fi (Wi-Fi for both phone and laptop at work as well, fyi). I've tried disabling the firewall on my Verizon router, enabling port forwarding, and just about everything else I could do for port 3000, and nothing has changed. Dear Server Fault geniuses, please help a poor developer out. :) Edit: Some follow up items to add. My Mac's firewall is not active, and all incoming requests are allowed. I've also verified on my phone and laptop, that they're on the same network (192.168.1.4 Mac, 192.168.1.9 Phone). I have no idea why this isn't working. Edit 2: I went into System Preferences, enabled Web Sharing, and tried to view the website from my phone and it didn't connect. So it's not WEBrick or related to Rails. The firewall on my machine is off and the firewall on my router is off. Edit 3: Some progress. I set up port forwarding for port 3000 to my laptop, found the external IP, and used that and it connected fine. So, there's definitely something not quite set up correctly on my internal network.

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• Wireless Network Performance Issues

  - by colithium

  My brand new Dell XPS system has been running flawlessly except its abysmal download speeds. I have tried isolating every variable I could possibly think of but I can't figure out the problem. I've talked to Dell and Belkin without making progress (thought I'd try). Here are the speeds: Note that most of the time, upload speeds are actually much faster than download speeds (around 4.0 Mb/s which is better than most other devices on the network) It's not the ISP. The slowdown happens even when transferring files inside the network. Plus every other wireless device gets approximately this: It's not the wireless router. It's a Lynksis WRT160N v1 with the latest firmware (1.02.2). Plus everything else connected to it has normal speeds. It's not the browser. Speeds are the same in IE, FF, and when transferring files with Windows between computers. It's not the wireless adapter. I've tried a Belkin N Wireless USB Adapter (which works fine on another computer) and a Dell Wireless Draft 802.11n WLAN Mini-Card. They have the same slow speeds when connected to the problem computer. It's not the adapter connection. One adapter used USB and the other is a Mini-Card. It's not antenna placement. With the same antenna position and the same device, I get different speeds when connected to the problem computer vs a good computer. Plus everything reports the connection speed as at least 11Mbps and good signal strength. I've tried disabling IPv6 since it sometimes causes weird problems. I've tried disabling Windows Firewall/anti-virus. I've ensured the computer has updated drivers for both adapters. I've ensured that Windows is up to date and so is the BIOS. For the USB adapter I ensured that that USB port functioned at normal speeds with other USB devices. What else could it possibly be? I finally received my copy of Windows 7 and will be trying that. I'd rather not install Windows 7 because of a particular program that will stop working so a solution besides that is welcome. Specs: Vista x64 Core i7 920 6GB RAM 500GB HD GTX 260

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• unable to access a NAT'ed IP via a VPN on Windows 7

  - by crmpicco

  I connect to a range of servers hosted by one provider via a VPN. I can connect to the VPN fine, however when I then go and try and connect to the server(s) it fails. A NAT'ed IP address that has worked up until today, has stopped working either via SSH/SFTP. As you can see below, if I try and ping the IP then it responds with Destination host unreachable, but, for some reason it says the reply is from 192.168.0.8? If it enter this IP address in my browser, I get nothing. Where is this IP coming from and is there any good reason why I cannot access the IP I am trying to ping? C:\Users\crmpicco>ping 172.26.100.x Pinging 172.26.100.x with 32 bytes of data: Reply from 192.168.0.8: Destination host unreachable. Reply from 192.168.0.8: Destination host unreachable. Reply from 192.168.0.8: Destination host unreachable. Reply from 192.168.0.8: Destination host unreachable. Ping statistics for 172.26.100.x: Packets: Sent = 4, Received = 4, Lost = 0 (0% loss), I have the VPN remote host address of 80.75.67.x, which shows me as being connected. But i'm unsure if there is a config issue at the server side or my end that has caused this issue? I have had some recent Win7 (automatic) updates, but it's hard to tell if that's caused this problem. This is my output from arp: C:\Users\cmorton>arp -a Interface: 192.168.0.8 --- 0xe Internet Address Physical Address Type 192.168.0.1 00-18-4d-b9-68-5e dynami 192.168.0.6 00-f4-b9-68-0c-9a dynami 192.168.0.7 08-00-27-f2-9f-d6 dynami 192.168.0.255 ff-ff-ff-ff-ff-ff static 224.0.0.22 01-00-5e-00-00-16 static 224.0.0.251 01-00-5e-00-00-fb static 224.0.0.252 01-00-5e-00-00-fc static 239.255.255.250 01-00-5e-7f-ff-fa static 255.255.255.255 ff-ff-ff-ff-ff-ff static Interface: 192.168.56.1 --- 0x15 Internet Address Physical Address Type 192.168.56.255 ff-ff-ff-ff-ff-ff static 224.0.0.22 01-00-5e-00-00-16 static 224.0.0.251 01-00-5e-00-00-fb static 224.0.0.252 01-00-5e-00-00-fc static 255.255.255.255 ff-ff-ff-ff-ff-ff static

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• Why does my computer run slowly and freeze sometimes?

  - by Brae

  EDIT I disabled sound in the BIOS, rebooted and it hung. I removed the (previously) faulty HDD, rebooted and it hung. I have managed to get my Realtek audio manager open again after its mysterious disappearance. Subsequently my microphone is now working again, to fix it I had to uninstall audio drivers, disable audio in BIOS, install audio drivers, enable audio in BIOS. Access via network (with faulty HDD in) seems to not be triggering hangs at the moment. I think with the sound problem fixed it might play a little nicer, but I think its still going to hang. If it does, then I'm fairly sure its been narrowed down to the mobo. EDIT Pretty convinced my motherboard is the culprit, because nothing else seems to have any obvious problems (bar the hard drive, which the PC still hangs without it being plugged in) So thank you all for helping, once I get more rep ill up a few of the answers. My PC is doing some weird things... Sometimes when I open up a program, lets say Adobe Photoshop, it will load everything normally, nice and quick no problems and I can use it fine. Other times its a little odd, and it loads the program as if it's only using half of the CPU. It's pretty obvious when it does it, normally the loading screen skims past, but when it does this weird load you see it slowly tick though each thing, and the program itself becomes incredibly slow. Even Google Chrome does it sometimes. Yet when I exit and reopen the program without doing anything else, it typically opens fine without lagging. I think this problem is probably a symptom of something bigger, because of other problems I'm having. Random hangs; no matter what I have open or what I'm doing. My PC will sort of freeze up for a few seconds. If music is playing it will either loop the last second or two, or it will buzz. This only lasts for a few seconds then it returns to normal without having to restart. During this time all programs lock up and freeze, and the mouse and keyboard are useless. I am also having a weird issue with my audio jacks, without touching my PC at all, sometimes I will see a popup saying that I have unplugged something or plugged something in, neither of which has actually happened. Pretty sure this is cause by the motherboard. I recently had a 'Pink Screen of Death' (yes pink) which pointed to my audio drivers. The lockups seem to happen with some consistency when someone is accessing my shared files via my home LAN. Which leads me to believe either one of my hard drives is acting up or more likely the controller. One of my drives had a bit of a crash before, I used Spinrite and managed to recover my stuff and now the drive appears to be working okay. This is possibly adding to the problems. My best guess is something has gone wrong with my motherboard, possibly a power issue or a chip has died, I really don't know. So what I would like to know is: Have I have missed some obvious diagnostic to help figure out what it is, or should I just bite the bullet and assume its my motherboard acting up and buy a new system? dxdiag[64-bit] - http://pastebin.com/G30kb2TL PSOD (minidump) - http://pastebin.com/aZsv0H56 HWiNFO64 (system info / specs) - http://pastebin.com/X6h3K8g6

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• Cannot Send Item error in Outlook - permissions to registry?

  - by Tim Alexander

  The issue I am trying to solve is to do with users getting a Cannot Send Item error in Outlook 2007 connecting to Exchange 2007. Basically if there is an image in the email (either one they have pasted in or one from another email in the chain) they get a "Cannot Send Item" error. Initially thought it was a citrix issue but users get it when they RDP to a server as well. Changing the message to Rich Text works 80% of the time but I do not think this is a solution but more of a temporary workaround. After some troubleshooting we found that the error can be fixed by adding the user as a member of the local power users group. of course this is not really a fix. My thoughts were that the ability of a power user to add/remove software may give them more access to the registry which might allow them to get round a restriction that is in place for a normal user. I have tried going through a procmon but the wealth of information is confusing. It initially looked like it may be an Outlook 2007 email security setting but this does not change between power user and normal user (set to 1 in the registry, "Use the security setting from Outlook Security Settings Public Folders"). I am struggling to fine tune my troubleshooting to work out exactly what is blocking it. Has anyone had an experience with an error similar to this? Or are there any tips for trying to track down issues via procmon as I must admit my approach seems somewhat lacking :) EDIT: So I have trawled through the two logs we have from process monitor (one as a power user and one a normal user). annoyingly I can find no obvious difference where something is denied access. There are more access denied events in the normal user log but these are quickly followed by sucessful entries to the same path fractions of a second later. The only thing that does stand out is an access denied to HKCR.html. This does not even appear in the power user version of the log. From what I understand this helps determine the default browser which ties in nicely with the fact that 9 out of 10 times you can send the message as Rich Text. EDIT: Looks like KB2509470 was causing the issue. Not really sure why but when I can work out what it does and why it causes the problem will post here unless anyone beats me to it!

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• Loss of wireless network connectivity when playing video via HDMI cable

  - by Jeff Fohl

  Hi Folks - New to Super User, so I hope this question fits in with the guidelines. Very strange problem I am having, and I am at a loss as to how to continue troubleshooting this one. The basic problem is that when I attempt to watch streamed video on a particular display device (an Optoma HD180 projector), my network connectivity drops like a stone to barely measurable levels. This is my setup: I have a Dell H2C 730x running Windows 7 64bit. This particular computer has two ATI Radeon HD 4800 video cards. I have two Samsung 22" monitors connected to one card, and an Optoma HD180 digital projector connected to the other card via an HDMI cable. My internet connection is normally a reliable 6Mbps. The problem I am having occurs when I stream video (or even just browse the web) on the Optoma Projector. When I do this, my internet connection drops to practically zero (just a few kilobits per second). When I move the browser away from the projector, and over to one of my Samsung monitors, the internet connection comes right back. Note that the Optoma projector is on and enabled as a third monitor all this time. I can move the mouse around on the projector without triggering the problem. I tried pinging my router when I was playing a movie on one of the monitors, and I get a 1 millisecond response. However, when I have the movie playing on the Optoma projecter, pinging the router gives me response times in the hundreds of milliseconds, or times out completely. So, it clearly is something local to my machine - and not some sort of throttling occurring down the line. I would think that it is possibly something to do with the HDMI driver conflicting somehow with my network driver (which is a USB-based wireless connection). This one has me really stumped. Anyone have any ideas? EDIT: I am now leaning towards the possibility that the HDMI cable is somehow interfering with the wireless network, when large amounts of data are being pushed through the cable. Is this possible?

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• ISPconfig3 + CentOS 6.2 , confused on how to move forward after initial install?

  - by Damainman

  I installed ISPCONFIG3 on centos 6.2 using the great guide on howtoforge.com. Everything is up and running and I can access ISPCONFIG via a browser. However I am not sure how to move forward with the initial setup so I can setup the very first account and get my website live. Details: Only have 1 server, the centos+ispconfig is running on a virtual machine of XEN XCP. I setup the server name to be server1.mydomain.com. I only have 2 usable ips. I plan to use them as follows: xx.xx.xx.01 : For my website and the websites of all accounts I add. xx.xx.xx.02 : For ns1.mydomain.com and ns2.mydomain.com (Yea I know they should be different ips at different locations, but this is what I have to work with at the moment.... ) I registered the nameservers at my registrar with the .02 ip. I want to use bind and ISPconfig to run the DNS on my server itself and not via my registrar. Right now if I go to the .01 IP it shows the centos+apache successful install page. So to break it down basically I am not sure where to start when it comes to: (What to consider and what to do to setup the first domain on the server) Telling bind to use the name server domains with .02. Setting up my First website(which will be my main website) in ISPconfig so mydomain.com resolves properly to my server. Make it so when you go to the .01 IP, it either redirects or shows the contents of my main website. (If this can't be done, then any advice is appreciated) Making sure that when I add a new domain, it automatically puts in the proper information for the domain so it points to the right mail, database, dns, entry. If I overlooked a tutorial then please feel free to let me know, and any advice would be greatly appreciated. Some of the tutorials I found were not specific to doing everything on only one server with Centos+Apache+Bind. Right now all I did was install centos and install ISPconfig3. Trying to move forward correctly so I don't mess up everything I did by not knowing what to do. Thank you in advance!!

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• How do Windows 7 encrypted files look like?

  - by Sean Farrell

  Ok this is kind of an odd question: How do Windows 7 (Home Premium) encrypted files look like "from the outside"? Now here is the story. An acquaintance of a freind of mine got a nasty virus / scareware. So I wiped out my PC technician cap and went to work on it. What I did was remove the drive from the laptop and put drive into my external drive bay. I scanned the drive and yes it was loaded with stuff. That basically cured the infection and I could start the system back up. To check if it cured the problem I wanted to see the system while running. There where two user accounts, on with a password and one without (both admin users !?!). So I logged into the unprotected user and cleaned up the residual issues, like proxy server to localhost in the browser config. Now I wanted to do the same for the password protected user. What I noticed that from my system and the unprotected user account the files of the protected user looked garbled. The files are something like 12 random alphanum chars, but the folders looked ok. Naive as was thought this might be how encrypted files looked "from the outside". (I never use Microsoft's own security features, so how would I know. TrueCrypt is one big blob.) Since the second user could not be reached, I though sod it and removed the password from the account. (That might have been a mistake, I know.) Now I did the same clean up tasks and all nice and fine; except for the files which where still "encrypted". So I looked into many Windows Encrypted Files recovery posts and not all hope is lost, since I should be able to extract the certificate and with the password regain access to the files. Also note that windows did "only" prompt me that removing the password would be insecure, not that access to encrypted files would be lost, like it is claimed in most recovery articles. Resetting the password did not help and I gave up for the night. The question that nagged me half of the last night was, what if the files are not encrypted, but the scare-ware encrypted / destroyed the files? I don't want to spend hours of work trying to recover files that are not recoverable. The ting is that the user does not remember turning it on and aren't the files marked in blue and the filename is readable? Many thanks for input from users who have more knowledge about WEF...

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• How is DNS used by individual processes?

  - by atroon

  When resolving FQDNs or machine names to IP addresses on my local network (mycompany.internal) I can use dig on the command line (linux/mac) or nslookup (windows) to query the configured server and get a response. But trying to enter the FQDN or even just the machine name in a ping command or in a web browser results in 'Unknown Host' or DNS errors. Here's a sample, this one from the Mac: mac:~ atroon$ dig server.mycompany.internal ; <<>> DiG 9.6.0-APPLE-P2 <<>> server.mycompany.internal ;; global options: +cmd ;; Got answer: ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 5219 ;; flags: qr aa rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 0 ;; QUESTION SECTION: ;server.mycompany.internal. IN A ;; ANSWER SECTION: server.mycompany.internal. 1200 IN A 172.16.254.36 ;; Query time: 0 msec ;; SERVER: 172.16.254.8#53(172.16.254.8) ;; WHEN: Wed Dec 16 11:39:15 2009 ;; MSG SIZE rcvd: 55 mac:~ atroon$ ping server.mycompany.internal<br> ping: cannot resolve server.mycompany.internal: Unknown host I cannot for the life of me figure this one out. The DNS server is a SBS 2003 box which handles AD, some file/print, etc for a small company network. This issue happens to me about three times a week, and when I'm connected to the local network directly, the same switch as the server even. I can make any connection I want with IP addresses, I just can't make DNS work. Additionally, at the same time I'm experiencing this, other users are fine, which makes me think it's a problem on my Mac. But what sort of problem? How can dig send a query and get a reply, and ping say 'unknown host'? I'm posting here vs. serverfault because I think this is a local problem not a server problem...but if anyone can point me at the server, I guess we'll head down the street a domain or two.

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• configuring mod_proxy_html properly?

  - by tobinjim

  I have an apache2 web server that handles reverse proxy for Rails3 app running on another machine. The setup works except URLs generated within the webapp aren't getting rewritten by my configuration for mod_proxy_html. The ["Reverse Proxy Scenario"][1] is exactly what I'm trying to do, so I've followed the tutorial as completely as I know how. I've applied or tried answers supplied here on stackoverflow, to no effect. According to the "Reverse Proxy Scenario" you want a number of modules loaded. All those instructions are in my httpd.conf file and when I examine the output from apactectl -t -D DUMP_MODULES all the expected modules show in amongst the listing. My external web server doing the reverse proxy is at www.ourdomain.org and the Rails app is internally available at apphost.local (the server is Mac OS X Server 10.6, the rails app server is Mac OS X 10.6). What's working right now is access to the webapp via the reverse proxy as: http://www.ourdomain.org/apphost/railsappname/controllername/action But none of the javascript files, css files or other assets get loaded, and links internal to the web app come out missing the apphost portion of the URL, as if my rewrite rule is configured incorrectly (so of course I've focused on that and can't seem to get anything to be added or deleted in the process of passing the html in from the apphost and out through the Apache server). For instance, hovering over an action link in the html returned by the web app you'll get: http://www.ourdomain.org/railsappname/controllername/action Here's what my Apache directives look like: LoadModule proxy_html_module /usr/libexec/apache2/mod_proxy_html.so LoadModule xml2enc_module /usr/libexec/apache2/mod_xml2enc.so ProxyHTMLLogVerbose On LogLevel Debug ProxyPass /apphost/ http://apphost.local/ <Location /apphost/> SetOutputFilter INFLATE;proxy-html;DEFLATE ProxyPassReverse / ProxyHTMLExtended On ProxyHTMLURLMap railsappname/ apphost/railsappname/ RequestHeader unset Accept-Encoding </Location> After every change I make to httpd.conf I religiously check apachectl -t just to be sane. I'm definitely not an Apache expert, but all the directives that follow mine seem to not overrule what I'm doing here. But then nothing that I try seems to alter the URLs I see in my browser after hitting the Apache server with a request for my web app. Even if you can't tell what I've done incorrectly, I'd welcome ideas on how to get Apache to help see what it's working on and doing to the html coming from my web app. That's what I understood the ProxyHTMLLogVerbose On and LogLevel Debug to be setting up, but I'm not seeing anything in the log files.

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• dig @my-server-ip mydomain.com works from inside, not from outside?

  - by x4954

  My server has 2 ips: x.x.x.73 and x.x.x.248. I can access my site via these ips, using Web browser. {Now, from a CentOS machine (not my server), using terminal} If I: dig @x.x.x.73 mydomain.com dig @x.x.x.248 mydomain.com I get the result: Connection timed out; no server could be reached. Could somebody please tell me how to fix it? Thank you. More information: If I log in to my server using ssh and do: dig @x.x.x.73 mydomain.com dig @x.x.x.248 mydomain.com I can see my zone shown as expected: ; <<>> DiG 9.3.6-P1-RedHat-9.3.6-16.P1.el5_7.1 <<>> @x.x.x.73 mydomain.com ; (1 server found) ;; global options: printcmd ;; Got answer: ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 12757 ;; flags: qr aa rd ra; QUERY: 1, ANSWER: 2, AUTHORITY: 2, ADDITIONAL: 2 ;; QUESTION SECTION: ;mydomain.com. IN A ;; ANSWER SECTION: mydomain.com. 38400 IN A x.x.x.73 mydomain.com. 38400 IN A x.x.x.248 ;; AUTHORITY SECTION: mydomain.com. 38400 IN NS ns2.mydomain.com. mydomain.com. 38400 IN NS ns1.mydomain.com. ;; ADDITIONAL SECTION: ns1.mydomain.com. 38400 IN A x.x.x.73 ns2.mydomain.com. 38400 IN A x.x.x.248 ;; Query time: 20 msec ;; SERVER: x.x.x.73#53(x.x.x.73) ;; WHEN: Sun Jan 15 11:46:30 2012 ;; MSG SIZE rcvd: 129 BIND version 9.3.6, Centos 5. Logging to my server using ssh, do inga "dig google.com" also shows expected results.

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• Localhost has just stopped working (using xampp)

  - by Joe Taylor

  I installed Xampp to use for local development of a Drupal site. Its been working fine out of the box until now. The main Xampp localhost welcome menu loads, however my subdirectory (localhost/drupal) doesn't. It just spins in the browser for ages and nothing happens. Just a blank screen. I've tried the edit people suggest in the hosts file but that hasn't work and I'm getting no errors so not sure what to do. Anyone have any ideas what might be wrong? PS I'm running Windows 7 edit: Log files: Fatal error: Allowed memory size of 134217728 bytes exhausted (tried to allocate 123731968 bytes) in C:\xampp\apps\drupal\htdocs\sites\all\themes\directory\node--job.tpl.php on line 41 Fatal error: Allowed memory size of 134217728 bytes exhausted (tried to allocate 123731968 bytes) in C:\xampp\apps\drupal\htdocs\sites\all\themes\directory\node--job.tpl.php on line 41 [Tue Nov 05 20:52:07.242454 2013] [ssl:warn] [pid 8432:tid 260] AH01909: RSA certificate configured for www.example.com:443 does NOT include an ID which matches the server name [Tue Nov 05 20:52:07.331459 2013] [core:warn] [pid 8432:tid 260] AH00098: pid file C:/xampp/apache/logs/httpd.pid overwritten -- Unclean shutdown of previous Apache run? [Tue Nov 05 20:52:07.820487 2013] [ssl:warn] [pid 8432:tid 260] AH01909: RSA certificate configured for www.example.com:443 does NOT include an ID which matches the server name [Tue Nov 05 20:52:07.898492 2013] [mpm_winnt:notice] [pid 8432:tid 260] AH00455: Apache/2.4.4 (Win32) OpenSSL/0.9.8y PHP/5.4.16 configured -- resuming normal operations [Tue Nov 05 20:52:07.898492 2013] [mpm_winnt:notice] [pid 8432:tid 260] AH00456: Server built: Feb 23 2013 13:07:34 [Tue Nov 05 20:52:07.898492 2013] [core:notice] [pid 8432:tid 260] AH00094: Command line: 'c:\xampp\apache\bin\httpd.exe -d C:/xampp/apache' [Tue Nov 05 20:52:07.905492 2013] [mpm_winnt:notice] [pid 8432:tid 260] AH00418: Parent: Created child process 7588 [Tue Nov 05 20:52:08.882548 2013] [ssl:warn] [pid 7588:tid 272] AH01909: RSA certificate configured for www.example.com:443 does NOT include an ID which matches the server name [Tue Nov 05 20:52:09.467582 2013] [ssl:warn] [pid 7588:tid 272] AH01909: RSA certificate configured for www.example.com:443 does NOT include an ID which matches the server name [Tue Nov 05 20:52:09.534585 2013] [mpm_winnt:notice] [pid 7588:tid 272] AH00354: Child: Starting 150 worker threads. Fatal error: Allowed memory size of 134217728 bytes exhausted (tried to allocate 123731968 bytes) in C:\xampp\apps\drupal\htdocs\sites\all\themes\directory\node--job.tpl.php on line 41 Fatal error: Allowed memory size of 134217728 bytes exhausted (tried to allocate 123731968 bytes) in C:\xampp\apps\drupal\htdocs\sites\all\themes\directory\node--job.tpl.php on line 41

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• What are the most likely bottlenecks determining the performance of CamStudio screen recording?

  - by Steve314

  When doing screen recording, I can get a frame rate of maybe 15 frames per second for the full screen on my 1080p monitor using the XVID codec. I can increase the speed a bit by recording a region, changing screen modes, and tweaking other settings, but I'm curious what hardware upgrades might give me the biggest bang for my buck. My PC is budget, but modern... Athlon 2 X4 645 (3.1GHz, quad core, limited cache) processor. 4GB single channel DDR3 1066 RAM. ASRock motherboard with NVidia GeForce 7025/nForce 630a Chipset. ATI Radeon HD 5450 graphics card - 512MB on board, not configured to steal system RAM. I dual-boot Windows XP and Windows 7. For the moment, XP is my bigger performance concern as it's still my getting-things-done O/S as opposed to my browser-host O/S. My goal is to make a few programming-related tutorials. For a lot of that I don't need screen recording - I can make up some slides, record audio with the PC switched off, yada yada. When I do need screen recording, I'll mostly be recording Notepad++, Visual Studio or a command prompt. Occasionally, I may be recording some kind of graphics or diagram program and using my pre-Bamboo cheap Wacom tablet - I have the CS2 versions of Photoshop and Illustrator, but I'd much more likely be using Microsoft Paint. Basically, what I'll be recording won't be making huge demands on the machine - but recording a fair number of pixels (720p preferred) will be useful. What's particularly wierd - not so long ago I still had a five-year-old Pentium 4 based PC. And (with the same 1080p monitor) it could record at not far from the same frame rate. So clearly the performance issues are more subtle than just throw-money-at-it. My first guess would be that the main bottleneck is the bandwidth for transferring data to/from the graphics card. Is that likely to be correct? In support of that, see this [Radeon HD 5450 review][1] - the memory bandwidth is only 12.8 GB/s. If you can't get data out of graphics memory quickly, you can't transfer it back to the system memory quickly. Apparently, that's slower than some top-end cards in 2002.

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• All internet requests in Windows time out

  - by Brandon

  So, I've run into a very strange problem with my home wireless network. Previously, at seemingly random times, the router seemed to disconnect all wireless hosts and cause all of the wired hosts to have a "limited connection" according to windows. In order to fix this, I had to unplug all of the wired hosts from the router, unplug the modem from the router, and power cycle the router. This seemed to solve the problem for a while until the exact same thing happened a day later and I had to go through the same process again. That's where I noticed something weird happening. There was one wireless host (a Windows Vista laptop) that seemed to be causing the router to disconnect the other hosts whenever it connected. When this happened, only that laptop was able to use the wireless from the router. When this happened, I disconnected it from the wireless (by disabling the wireless adapter) then reconnected it (by re-enabling it) and now it, like the other hosts, couldn't connect. I've never really seen anything this strange happen on our network before. So, I restored the router to factory settings and the problem seems to have vanished except one crucial problem. There's another host (a Windows 7 laptop) that was perfectly able to connect before all of the router issues and even in between the crashing and power-cycling events but now says its connected and says it's able to reach the Internet, but all requests time out. In any browser I've tried, the tab says connecting to [site]... for a solid minute and then tells me the request timed out. When I try to ping google.com in cmd it also says request timed out. In frustration, I booted into a dual-boot Ubuntu installation on the Windows 7 host and the connection works fine, to my surprise, as ubuntu is where I am now typing this rather long question. I haven't looked through the event log in windows but will post anything I find in an edit I haven't tried connecting (in Windows 7) to any other wireless network, since The fact that it works in Ubuntu suggests its Windows and not the router but I didn't change any wireless settings in windows before it being able to reach the Internet and not. Does anyone have any clue what could have happened. I opened to buying another router as this one is almost a year old :) but I would like to know whats going on here. Thanks in Advance! P.S. Sorry for how long my question is, I'm a little anxious (:

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• "The server closed the connection without sending any data"

  - by Toby

  Server setup The problem Diagnostic information What I've tried Specific Help needed 1. I have the following server setup: Debian Squeeze Linux 2.6.32-5-amd64 Apache2-mpm-prefork 2.2.16-6+squeeze10 PHP 5.3.3-7+squeeze14 This server is protected with the Suhosin Patch 0.9.9.1 Max Requests Per Child: 0 - Keep Alive: on - Max Per Connection: 100 Timeouts Connection: 300 - Keep-Alive: 15 Loaded Modules core mod_log_config mod_logio prefork http_core mod_so mod_alias mod_auth_basic mod_auth_digest mod_authn_file mod_authz_default mod_authz_groupfile mod_authz_host mod_authz_user mod_cgi mod_deflate mod_dir mod_env mod_mime mod_negotiation mod_php5 mod_reqtimeout mod_rewrite mod_setenvif mod_ssl mod_status Wordpress 3.4.2 (Upgrading to 3.5 soon :) 2. The problem When I restart the server (sudo shutdown -r now), going to any website page results in the following error from the web browser (in this case, Google Chrome, but other browsers also show the same error). This error can also occur an hour or so after all is working ok, seemingly randomly, which is my biggest concern as it means my server is not reliable: No data received Unable to load the web page because the server sent no data. Here are some suggestions: Reload this web page later. Error 324 (net::ERR_EMPTY_RESPONSE): The server closed the connection without sending any data. 3. Diagnostic information The apache error log contains the folowing entries: [Fri Dec 14 22:23:27 2012] [notice] child pid 1955 exit signal Floating point exception (8) [Fri Dec 14 22:23:27 2012] [notice] child pid 1956 exit signal Floating point exception (8) [Fri Dec 14 22:23:29 2012] [notice] child pid 1957 exit signal Floating point exception (8) [Fri Dec 14 22:23:30 2012] [notice] child pid 1958 exit signal Floating point exception (8) [Fri Dec 14 22:23:32 2012] [notice] child pid 1959 exit signal Floating point exception (8) [Fri Dec 14 22:23:32 2012] [notice] child pid 1960 exit signal Floating point exception (8) [Fri Dec 14 22:23:34 2012] [notice] child pid 1961 exit signal Floating point exception (8) [Fri Dec 14 22:23:34 2012] [notice] child pid 1962 exit signal Floating point exception (8) 4. What I've tried a) I can 'fix' the website temporarily by resetting the server twice (resetting it once does not work) using the following commands. NB: the 'reload' option does not work, I have to use restart twice. However, the error can reoccur sometime later. sudo /etc/init.d/apache2 restart sudo /etc/init.d/apache2 restart b) I have tried disabling suhosin by uninstalling php5-suhosin, but a php info page still shows "This server is protected with the Suhosin Patch 0.9.9.1". I have tried putting Suhosin into simulation mode by creating a file /etc/php5/apache2/conf.d/suhosin.ini containing: [suhosin] suhosin.simulation = On The php info page shows the suhosin.ini file in the list of "Additional .ini files parsed" but the php info page still shows "This server is protected with the Suhosin Patch 0.9.9.1" c) Increasing the PHP memory limit In /etc/php5/apache2/ : ; Maximum amount of memory a script may consume (128MB) ; http://php.net/memory-limit memory_limit = 512M d) Disabling all Wordpress plugins, and going back to the default theme. 5. Specific help needed I would very much like help in debugging what is going on here. I am not sure how to determine what processes are in the Apache error log which are exiting "[notice] child pid 1955 exit signal Floating point exception (8)", or what is causing them to exit. And whether suhosin is part of the problem (and how to disable it if it is). Thank you in advance for any advice or tips you can offer in helping me debug this.

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• two different virtual hosts, one page displayed

  - by majdal

  Hello! I have two different sites configured using virtual hosts (the content of the virtualhost files is posted below) i just copied the default file and edited a few lines... When i direct my browser to either of the two sites, only the content of the first of the two appears... Why? <VirtualHost *:80> ServerAdmin [email protected] DocumentRoot /var/www/hunterprojects.com/public_html <Directory /> Options FollowSymLinks AllowOverride None </Directory> <Directory /var/www/hunterprojects.com/public_html> Options Indexes FollowSymLinks MultiViews AllowOverride None Order allow,deny allow from all </Directory> ScriptAlias /cgi-bin/ /usr/lib/cgi-bin/ <Directory "/usr/lib/cgi-bin"> AllowOverride None Options +ExecCGI -MultiViews +SymLinksIfOwnerMatch Order allow,deny Allow from all </Directory> ErrorLog /var/log/apache2/error.log # Possible values include: debug, info, notice, warn, error, crit, # alert, emerg. LogLevel warn CustomLog /var/log/apache2/access.log combined Alias /doc/ "/usr/share/doc/" <Directory "/usr/share/doc/"> Options Indexes MultiViews FollowSymLinks AllowOverride None Order deny,allow Deny from all Allow from 127.0.0.0/255.0.0.0 ::1/128 </Directory> </VirtualHost> AND THE SECOND ONE: <VirtualHost *:80> ServerAdmin [email protected] DocumentRoot /var/www/dodolabarchive.ca/public_html <Directory /> Options FollowSymLinks AllowOverride None </Directory> <Directory /var/www/dodolabarchive.ca/public_html> Options Indexes FollowSymLinks MultiViews AllowOverride None Order allow,deny allow from all </Directory> ScriptAlias /cgi-bin/ /usr/lib/cgi-bin/ <Directory "/usr/lib/cgi-bin"> AllowOverride None Options +ExecCGI -MultiViews +SymLinksIfOwnerMatch Order allow,deny Allow from all </Directory> ErrorLog /var/log/apache2/error.log # Possible values include: debug, info, notice, warn, error, crit, # alert, emerg. LogLevel warn CustomLog /var/log/apache2/access.log combined Alias /doc/ "/usr/share/doc/" <Directory "/usr/share/doc/"> Options Indexes MultiViews FollowSymLinks AllowOverride None Order deny,allow Deny from all Allow from 127.0.0.0/255.0.0.0 ::1/128 </Directory> </VirtualHost>

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• Trying to get DNS services running on Windows Server 2008 R2, what am I getting wrong ?

  - by LaserBeak

  Ok, So I am basically trying to get a home server pc up that will provide Domain name services, act as Mail server and web server. I have one static IP, well it's not officially static but hasn't changed in two years so I'll call it static. I have done the following: Configured router NAT/virtual port forward UDP/TCP port 53 to the internal IP of my server 192.168.1.16, in adapter settings specified the manual settings: 192.168.1.16 IP, gateway 192.168.1.1, Subnet: 255.255.255.0 and loopback DNS: 127.0.0.1 Using my public my public IP Checked using http://www.canyouseeme.org/ that port 53 is open and is not being blocked by my ISP. It can see services on this port. Registered Domain name (mydomain.com.au) Updated whois database through the domain registrars site and registered NameServer names: ns0.mydomain.com.au and ns2.mydomain.com.au, both have been associated with my single public IP. (Waited 24 hours) Update the nameserver for mydomain.com.au: primary ns0.mydomain.com.au secondary: ns2.mydomain.com.au (waited 24+ hours) Installed Server 2008 R2, install web server role and DNS role. Webserver works when I enter my public IP into browser of any PC/mobile, get IIS7 welcome page. In DNS server: Created new forward lookup zone: ; ; Database file mydoman.com.au.dns for mydomain.com.au zone. ; Zone version: 10 ; @ IN SOA mydomain.com.au. mydomain.testdomain.com. ( 10 ; serial number 900 ; refresh 600 ; retry 86400 ; expire 3600 ) ; default TTL ; ; Zone NS records ; @ NS ns0.mydomain.com.au. @ NS ns1.mydomain.com.au. ; ; Zone records ; @ A 192.168.1.16 www A 192.168.1.16 The Domain name services will however not work, the whois database updated with ns0.mydomain.com.au etc. but when I type in my site name www.mydomain.com.au from an external machine it will not open site and I can't even ping it (Can't find host) When I check the ns0.mydomain.com.au NS record using a tool Like: http://www.squish.net/dnscheck/ I get: Security: Server ns0.mydomain.com.au (XXX.XXX.XXX.XX <- my public IP) is recursive Domain exists but there is no such record Any ideas, thanks...

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• cd Command Linux and Mystery Flags

  - by Jason R. Mick

  Platform: CentOS 6.2 Shell:tcsh I'm playing around with cd for a BASH script, and noticed the wondrous cd - option, but was left with many questions... Why the cd -? Isn't this redundant with cd ..? EDIT [As FatalError points out, these two commands don't do the same things... so the answer is "no"] Can you delve farther back into your history with - flag, a la in a browser? e.g. When I type cd -, it takes me to my previous directory, but then if I enter that command again, it takes me to the directory I just came from, creating a sort of loop. Is a shorthand for going back multiple levels supported?EDITI realize I can go back with cd .., but was hoping this could be a gateway to a less verbose deep back, e.g. cd -3 vs. cd ../../../ ... hopefully that clarifies what I'm asking....EDIT2As to the current feedback, while .. is a special directory, I don't see a reason why the built-in cd to the terminal couldn't use a shorthand for ../../ ... ../ e.g. cd ..5 or why the built-in also couldn't have a history (a la auto pushd/popd) that could be turned on and used like cd -3. I get that this could be somewhat of security/privacy risk, but I don't see how it's any worst than storing a command history, which most shells/terminals do. The manpage for cd, accessible via man cd and help cd (it's the same for either command), only lists -L and -P flags. However when I type in cd --help it outputs Usage: cd [-plvn][-|<dir>].. Am I right in assuming the other flags and the - (back) option are nonstandard? What are the -n and -v flags for? Both seem to take me back to my home directory, that's all I've been able to figure out via experimentation. A quick read on web resources [1][2] offered just the same sort of info that the man page did and didn't answer my questions. Note: The second Linux-centric resource above claimed cd only had two options (obviously not true in current CentOS) hence my assumption that this functionality could be non-standard.

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• Nginx not working properly on subdomains

  - by javipas

  I've been trying to setup a Sugar CRM instance. I've got a domain that has its main site on a server (www.domain.com) and I've created a subdomain (sugar.domain.com), but I wnat this subdomain to be hosted on another server. This second server has nginx installed, and there's a working WordPress blog there on a virtualhost, so I would need to setup a second site. To do this I've created the directory structure, and I've created a /etc/nginx/sites-enabled/sugar.domain.com configuration file that has the following: * server { listen 80; server_name sugar.domain.com *.domain.com; access_log /var/www/sugar/log/access.log; error_log /var/www/sugar/log/error.log info; location / { root /var/www/sugar; index index.php; } location ~ .php$ { fastcgi_split_path_info ^(.+\.php)(.*)$; fastcgi_pass backend; fastcgi_index index.php; fastcgi_param SCRIPT_FILENAME /var/www/sugar/$fastcgi_script_name; include fastcgi_params; fastcgi_param QUERY_STRING $query_string; fastcgi_param REQUEST_METHOD $request_method; fastcgi_param CONTENT_TYPE $content_type; fastcgi_param CONTENT_LENGTH $content_length; fastcgi_intercept_errors on; fastcgi_ignore_client_abort on; fastcgi_read_timeout 180; } ## Disable viewing .htaccess & .htpassword location ~ /\.ht { deny all; } } upstream backend { server 127.0.0.1:9000; } As far as I know, I need the *.domain.com parameter on the "server_name" flag, but something is crashing here: I get either a 403 Forbidden error, or I get PHP code (I can read the PHP file code in the browser, like normal text) that somehow is not executed. I've tried setting permissions to 755 inside the /var/www/sugar/ directory, and I've also set up the owner:group with a chown -R www-data:www-data /var/www/sugar/ The thing is, I don't now if my mistake is in the nginx site configuration, in my folder permissions, or in other place :( Could it be because of the main domain (www.domain.com) is hosted on other server? Do they have to be together necessarily?

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• Nginx not working properly on subdomains [SOLVED]

  - by javipas

  I've been trying to setup a Sugar CRM instance. I've got a domain that has its main site on a server (www.domain.com) and I've created a subdomain (sugar.domain.com), but I wnat this subdomain to be hosted on another server. This second server has nginx installed, and there's a working WordPress blog there on a virtualhost, so I would need to setup a second site. To do this I've created the directory structure, and I've created a /etc/nginx/sites-enabled/sugar.domain.com configuration file that has the following: * server { listen 80; server_name sugar.domain.com *.domain.com; access_log /var/www/sugar/log/access.log; error_log /var/www/sugar/log/error.log info; location / { root /var/www/sugar; index index.php; } location ~ .php$ { fastcgi_split_path_info ^(.+\.php)(.*)$; fastcgi_pass backend; fastcgi_index index.php; fastcgi_param SCRIPT_FILENAME /var/www/sugar/$fastcgi_script_name; include fastcgi_params; fastcgi_param QUERY_STRING $query_string; fastcgi_param REQUEST_METHOD $request_method; fastcgi_param CONTENT_TYPE $content_type; fastcgi_param CONTENT_LENGTH $content_length; fastcgi_intercept_errors on; fastcgi_ignore_client_abort on; fastcgi_read_timeout 180; } ## Disable viewing .htaccess & .htpassword location ~ /\.ht { deny all; } } upstream backend { server 127.0.0.1:9000; } As far as I know, I need the *.domain.com parameter on the "server_name" flag, but something is crashing here: I get either a 403 Forbidden error, or I get PHP code (I can read the PHP file code in the browser, like normal text) that somehow is not executed. I've tried setting permissions to 755 inside the /var/www/sugar/ directory, and I've also set up the owner:group with a chown -R www-data:www-data /var/www/sugar/ The thing is, I don't now if my mistake is in the nginx site configuration, in my folder permissions, or in other place :( Could it be because of the main domain (www.domain.com) is hosted on other server? Do they have to be together necessarily?

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• Laptops on Windows Domain sometimes have problems accessing internet when off-site

  - by FSUScoot

  Hi all-- We've had this problem for a long time. When users travel, sometimes they can't get internet access from a wired or wireless connection. Here are a couple examples: 1) A user goes to a hotel and tries to access the wireless in their room. They can connect to the access point. They open a web browser and they can't get re-directed to the hotel's login page. Because they can't log in, there's no internet access. 2) A user goes to another laboratory/university and tries to access the wired network. They connect, link is fine, PC gets IP from DHCP but no internet access. There's no login page to be re-directed to. It should just "work". What I've found is that it's a DNS issue. Because the computer is on a Windows Domain, it seems it MUST use our DNS servers. Even if you connect to an outside network and do an ipconfig /all, it looks like everything is ok. It'll even show their DNS servers listed in the config. The computer just won't use the other network's DNS server. I found a reg key that keeps our DNS servers listed and it seems that they take priority every time: HKLM\SOFTWARE\Policies\Microsoft\Windows NT\DNSClient All the values under that key are for our AD domain. NameServer and Searchlist never change. What I've found is if the user edits the NameServer string and puts the DNS server of the network they're on, everything works just fine. They get re-directed to the hotel's correct login page or their internet access starts working. It's only a problem if the network they're on blocks outside DNS or a hotel that uses an internal name in their front page redirection that only their DNS server knows about, i.e., not public. If the re-direct page starts with an IP, like 10.10.10.10, it'll work just fine. Obviously this isn't a fix for everyone. Most of my users are pretty knowledgeable so it’s easy for me to walk them through or send them a .reg file that they can edit and run. This problem isn't limited to Windows 7. It was like this with XP as well. It's not hardware related. The problem exists on both wired and wireless, Intel or Broadcom, laptops or desktops. Anyone else have this problem? Is there a GPO I can change that I missed? Got a good work-around for this? Thanks for any help!

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• Mysterious visitor to hidden PHP page

  - by B. VB.

  On my website, I have a "hidden" page that displays a list of the most recent visitors. There exist no links at all to this single PHP page, and, theoretically, only I know of its existence. I check it many times per day to see what new hits I have. However, about once a week, I get a hit from a 208.80.194.* address on this supposedly hidden page (it records hits to itself). The strange thing is this: this mysterious person/bot does not visit any other page on my site. Not the public PHP pages, but only this hidden page that prints the visitors. It's always a single hit, and the HTTP_REFERER is blank. The other data is always some variation of Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 5.1; YPC 3.2.0; FunWebProducts; .NET CLR 1.1.4322; SpamBlockerUtility 4.8.4; yplus 5.1.04b) ... but sometimes MSIE 6.0 instead of 7, and various other plug ins. The browser is different every time, as with the lowest-order bits of the address. And it's just that. One hit per week or so, to that one page. Absolutely no other pages are touched by this mysterious vistor. Doing a whois on that IP address showed it's from the new york area, and from the "Websense" ISP. The lowest order 8 bits of their address are always different, but always from 208.80.194.*/8. From most of the computers that I access my website, doing a tracerout to my server does not contain a router anywhere along the way with the IP 208.80.*. So that rules out any kind of HTTP sniffing, I might think. I have NO idea how, why this is happening. Does anyone have any clue, or have seen something as strange as this before? It seems completely benign, but unexplainable and a little creepy. Thanks in advance!

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• Possible HDD malfunction. Need help in diagnosing

  - by Protheus

  Today when using my PC as I did for almost 4 years I experienced the following: during opening new tab in Opera browser screen froze. Music (AIMP 3) continued to play for about 5 minutes and then stopped too. I tried Ctrl+Alt+Del, but win7 lock screen didn't appear. Caps\Scroll or Num locks didn't switch diodes on keyboard. I rebooted my PC and saw that BIOS suggests me to enter it's settings or load by default. I chose default. It don't see proper boot device (old faitful "insert proper boot" something). After second reboot it said that there is no ExpressGate installed (which i turned off in BIOS years ago). I went into BIOS setting to turn off ExpressGate and see configs: time was not set off, all hard drives present, temp and O.C. settings are nominal (no O.C.) I've inserted my Win7 install disk to try recovery. It did load awfully long (about few minutes) and didn't see current installation. PC was utilized in 24/7 mode for almost all these years. Hardware configuration: ASUS P5Q WS Core 2 Quad Q9300 (2.5GHz no O.C.) MSI geForce GTX 460 4x2 Gb GeIL EVO 2 (AFAIR) Seagate something 750Gb (4 years as system HDD 24/7) WD 1Tb (for random stuff, 5 y.o.) Hitachi 500Gb (for even more random stuff, 6 y.o.) NEC DVDRW (ALL DISKS ARE SATA) Cooler Master Silent Pro 700W Software: Windows 7 AND Kubuntu on the same drive with GRUB loader. Sorry I can't remember HDDs and can't see them right now, but I think their models aren't relevant anyway. My idea is that due to some system error or hard drive glitch i've wrecked my primary HDD's MBR. Nevertheless I don't exclude the possibility of other failure. May it's be that motherboard or it's SATA controller? Doubt it, because all drives are seen in BIOS and I could load from DVD. Maybe GRUB got bugged somehow, although I don't see how it's possible from Windows. But I did install KUbuntu from Windows (i wasn't myself then), maybe GRUB did write itself in some windows partition and got rewriteen in process? Right now I am at work with my flash drive with me and I need some advice how to fix MBR or to hear if it's not MBR. I'm going to buy new HDD (Hitachi 7k2000) because I think that my current HDD is compromised and it's unsafe to use it as system drive, especially 24/7.

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• What DNS server to use for dynamic load-balancing of website?

  - by Marki555

  I will have 2 servers in different datacenters (different countries) and I want to use DNS load-balancing mainly for High Availability of website hosted on those 2 servers. It is just ad tracking site, which records hit in local database and returns few lines on html code. I want to return 2 A records each time because of DNS pinning in browsers (if one server fails, browser will try second A record which it has already cached). Both servers will be acting also as DNS servers for redundancy. Now comes my proposed solution: I will use BIND and have both servers as a master for that zone. On each server there will be running script, which will periodically test availability (http) of both servers and remove IP from DNS in case of failure. Now the questions :) 1) Is BIND suitable for this solution? I think BIND performance is good and it is easy to manipulate the zone file via script. And as I will modify the zone only in case of failure/maintenance, the modifications (and thus bind reload) won't be often. 2) I plan to use TTL of 5 minutes. The website will have about 1000-3000 req/s but from distinct clients (each IP only 1-3 requests), so I think the DNS load won't be too much. I suppose their ISPs will cache the responses for those 5 mins. Is there any reason to lower the TTL even more? 3) Is my master-master approach good? Or should I make one of the servers master and the other one slave? Right now each server can monitor both itself and the other one. If only webservice fails, both DNS nodes will notice it. If the whole server fails, then the remaining DNS node will notice it and the failed node will not answer DNS queries anyway. 4) Is it a big issue when one NS server does not respond to queries? If yes, I can make a third DNS, so anytime at least 2 of them would accept queries... 5) Should I rewrite the zone file via script, or just use dynamic DNS update (for example via nsupdateutility)?

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