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Articles indexed in October 2012

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• triple duplicate acknowledgement in TCP congestion control

  - by Salvador Dali

  If this doesn't belong here, please tell me where is an appropriate place for such question. I am trying to understand ideas behind tcp congestion control mechanisms, and I am failing to understand why we need triple duplicate acknowledgement to trigger window change. In my opinion, double duplicate acknowledgement will be enough to get that the previous package is lost. So why we need the third ack?

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• CSS, JS and images are not loading while sharing WAMP over local network

  - by Hardik Thaker

  I have share my wamp over my personal LAN . (Server IP : 192.168.0.100) When I am trying to access wamp server it's working perfectly. But when I open website hosted on server using client machine (192.168.0.103) , it doesn't load CSS - Images and JS files. So I saw console and found that my browser is trying to load : localhost//mysite/css/style.css And failing to load resource. now when I try to load the same resource directly from browser using 192.168.0.100/mysite/css/style.css It's showing me css file ! Now I am confused how to solve this problem so that my browser load that css perfectly ! Please help me ! thanks in advance !

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• Set ReturnPath globally in Postfix

  - by Gaia

  I have Magento using Sendmail and Wordpress using PHPmailer to send webapp-generated mail. Occasionally, someone will enter their email address incorrectly and the mail (let's say, a purchase receipt) will bounce back to the return-path specified by the script. I dont want to set the return path for each vhost, especially because it is not easily done. Ideally, WP would use the address of the blog admin and Magento would use one of the numerous email fields specified, but they default to using username@machinename (in my case, username is the system user and machinename is a FQDN, but it is not the same as the actual vhost FQDN). The result is that bounced mail returns to the server and, since the server is used only for outbound SMTP, the messages sit there, undelivered and worse, unread. I'm Postfix 2.6.6 on CentOS 6.3, is it possible to globally force a specific returnpath for all messages sent via PHP on the server?

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• difference between server and desktop

  - by user1241438

  I want to set up a webserver. I would like to buy a hardware for that and i am trying to understand if i should buy a desktop and host the webserver on that or do i have to buy some used server from ebay and host on it. Example is http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=180986172861&ssPageName=ADME:X:RTQ:US:1123 But what is the difference in desktop and server? These days even desktops are coming with high RAM. Only other difference i see is servers have RAID HARD disk. Is there any other difference?

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• Nginx ignoring client's HTTP 1.0 request and respond by HTTP 1.1

  - by Yoga

  I am testing using nginx/php5-fpm, with the code <?php header($_SERVER["SERVER_PROTOCOL"]." 404 Not Found"); // also tested: header("Status: 404 Not Found"); echo $_SERVER["SERVER_PROTOCOL"]; And force to use HTTP 1.0 with the curl command. curl -0 -v 'http://www.example.com/test.php' > GET /test.php HTTP/1.0 < HTTP/1.1 404 Not Found < Server: nginx < Date: Sat, 27 Oct 2012 08:51:27 GMT < Content-Type: text/html < Connection: close < * Closing connection #0 HTTP/1.0 As you can see I am already requesting using HTTP 1.0, but nginx reply me with HTTP 1.1

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• Ways to do simple failover with one server and two IPs

  - by CrassHoppr

  The setup is one server (Windows 2008) at one location with two incoming connections. As the server has to interface with various on-site devices, and will have a small number of incoming connections, a data center is not an option, and instead cable/dsl connections must be used. The goal is that users visit https://service.site.com and are sent to either the primary IP address or a secondary IP if the primary is down. I've seen advice to use round robin DNS for this, but caching an IP for a downed interface is something I'd like to avoid. Is something like this possible with these constraints?

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• Configuring EC2 Instance

  - by Philip Isaacs

  Forgive me if this seems like a dumb question, but I'm wondering how do I increase the processing power (cpu, memory) of an instance I already have running. Right now I have a web server running on a m1.small type instance and it's performing poorly at peak times, is it possible to increase the amount of memory on the instance somehow, or do I need to create a new EC2 install. What are my options. Please advise.

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• User start daemon .pid Permission denied

  - by kornnflake

  Trying to start a unicorn daemon as a non-root user but failing hard. Unicorn gives the the following error: directory for pid=/var/run/sinatra_test/sinatra_test.pid not writable So I made the following: sudo mkdir /var/run/sinatra_test sudo chown ruby:www-data /var/run/sinatra_test sudo chmod g+w /var/run/sinatra_test ls -ld /var/run/sinatra_test returns: drwxrwxr-x 2 ruby www-data 60 Oct 27 09:55 /var/run/sinatra_test What am I missing? Still getting Permission denied errors.

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• How to block this URL pattern in Varnish VCL?

  - by iTech

  My website is getting badly hit by spambots and scrappers, I am using Cloudflare but the problem still remains there. The problem is spambots accessing non-existing urls causing a lot of load to my drupal backend which goes all the way and bootstraps db just to serve a 404 error doc. I cant simply dish out non-drupal 404's for all page not found errors, as I need to have drupal catch them. Since, varnish is in front it can check if the bot is acting nice and asking for valid url - if not it servers them a 404 or 403. These bots are causing errors using this pattern : http://www.megaleecher.net/http:/www.megaleecher.net/Using_iPhone_As_USB_Mass_S/Using_iPhone_As_USB_Mass_S/Using_iPhone_As_USB_Mass_S/Using_iPhone_As_USB_Mass_S/Using_iPhone_As_USB_Mass_S/Using_iPhone_As_USB_Mass_S/Using_iPhone_As_USB_Mass_S/Using_iPhone_As_USB_Mass_Storage Now, pls. suggest a regex varnbisg VCL directive which catches this URL pattern and serves a 404 error from varnish, preventing it from reaching apache/drupal ?

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• Three apps going through apache. How to configure apache httpd?

  - by Chris F.

  I have a quick question but I've been struggling to find the best solution: I have two java webapps and wordpress (php) that I need to serve through my Prod website: App #1 should be accessed when pointing to www.example.com/ (this would have other url too such as "www.example.com/book") App #2 should be accessed when pointing to www.example.com/manage Finally WordPress would be accessed at www.example.com/info How can I configure apache to serve all these three instances at the same time? So far I have and it's not quite working right. Any suggestions would be much appreciated! Listen 8081 <VirtualHost *:8081> DocumentRoot /var/www/html </VirtualHost> ProxyPass /manage http://127.0.0.1:8080/manage ProxyPassReverse /manage http://127.0.0.1:8080/manage ProxyPass /info http://127.0.0.1:8081/info ProxyPassReverse /info http://127.0.0.1:8081/info ProxyPass / http://127.0.0.1:9000/ ProxyPassReverse / http://127.0.0.1:9000/

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• apache port number

  - by user983223

  For each development sites I want to have a unique port number. For instance, domain.com:1234 This is what I have in my httpd.conf file. After restart the page domain.com:1234 is not showing in the browser. Is there anything else that I need to do besides what I have already done to make this work? Listen *:1234 <VirtualHost *:1234> DocumentRoot /var/www/dev_sites/test ServerName domain.com:1234 </VirtualHost> It looks like if I go to my local hostname (kk.local:1234) it shows. Is there some sort of dns that I need to do? I really don't want to go into godaddy everytime I add a development site. Is there a way around that?

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• Connecting multiple ColdFusion 10 instances to a single Apache 2.2 server

  - by Adam Cameron

  This is on Windows 7 Home Premium edition. I have got two ColdFusion 10 (updater 2) instances: "cfusion" (the default one), and "scratch". I have got a single instance of Apache 2.2 running. Within Apache, I have set up two virtual hosts, each of which needs to be served by a different ColdFusion instance. Each of the CF instances serves files fine via Tomcat's internal web server. Apache serves vanilla HTML files fine too. So both CF instances, and both virtual hosts separately work OK. I can get wsconfig.exe to connect either one of the CF instances to the Apache server, and serve CF files via Apache & that instance. However I cannot find a way of connecting the second CF instance to Apache as well, so that both CF instances are conected, each serving one of the virtual hosts. WSConfig doesn't seem to understand the notion of "multiple CF instances", and the changes it makes to the httpd.conf (via mod_jk.conf) does not seem to be implemented in such a way as to accommodate multiple CF instances talking to a single Apache instance, or multiple virtual hosts. I freely admit to not being confident enough with how mod_jk (or even really httpd.conf) works to be able to guess if I can change stuff to make it work. If I try to add the second CF instance using WSConfig, I just get a message "the web server is already configured for ColdFusion". Be that as it may... not the instance of ColdFusion I want to connect it to! If I remove the existing connector to whichever instance is already connected, I can then connect the other one no problems. Not that this helps, but it demonstrates that the CF instance can connect to Apache. This all used to be fairly straight fwd under older versions of CF and JRun :-( The only docs I have found are on the "Connect multiple Apache virtual hosts on a web server to a single ColdFusion server" page, but that specifically only deals with a single CF instance. There is no equivalent page for multiple CF instances. I'm kinda hoping I can move some of the mod_jk config into my virtual host entries in httpd-vhosts.conf (this is how it used to work for JRun), but I've no idea what to put where. I think I've covered all the necessary info here? If not, sing out and I'll add more. Thanks. PS: tried to specifically tag this as "ColdFusion-10" as the answer will be different from previous CF versions, but it won't let me cos my rep on this site is too low (odd how it doesn't consider my rep from other S/O sites...). If someone with sufficient rep can add it, that'd be cool: it's probably a valid tag to have. Ta.

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• Xen PV packet loss

  - by Delphinator

  I'm having some serious issues with packetloss with one of my servers. This server is a somewhat old (P4-era) machine running Debian Squeeze and Xen 4.0. There are two domUs running on it (both also Debian Squeeze), one gateway and a fileserver. Unfortunatly the processor has no virtualization extensions, therefore only PV can be used. While investigating why our network seems to be slower than it should I found some pretty bad packet loss (~25%). After further investigation and several experiments I did a measurment between the dom0 and one of the domUs: Server listening on UDP port 5001 Receiving 1470 byte datagrams UDP buffer size: 110 KByte (default) ------------------------------------------------------------ ------------------------------------------------------------ Client connecting to dom0, UDP port 5001 Sending 1470 byte datagrams UDP buffer size: 110 KByte (default) ------------------------------------------------------------ [ 3] local 192.168.1.2(domU) port 33817 connected with 192.168.1.100(dom0) port 5001 [ 4] local 192.168.1.2(domU) port 5001 connected with 192.168.1.100(dom0) port 48606 [ ID] Interval Transfer Bandwidth [ 3] 0.0-10.0 sec 46.3 MBytes 38.7 Mbits/sec [ 3] Sent 33020 datagrams [ 3] Server Report: [ 3] 0.0-10.0 sec 46.2 MBytes 38.6 Mbits/sec 0.030 ms 89/33019 (0.27%) [ 3] 0.0-10.0 sec 1 datagrams received out-of-order [ 4] 0.0-10.2 sec 43.0 MBytes 35.3 Mbits/sec 13.074 ms 11575/42256 (27%) tl;dr: 27% packet loss from dom0 to domU with 50Mbit UDP packets. Same thing happens from anywhere in the network. The problem gets better for smaller bandwidths (0.047% for 5Mbit) and worse for higher (59% for 200Mbit) ones. I did increase the CPU-weight of the dom0, there is no swapping going on, and actual networking-hardware is not involved. I never expected Xen (or anything related) to drop packets, and I'm completly clueless what to try next.

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• htaccess rewrite different folder url, two index files

  - by Andrew

  I've been searching for awhile now and haven't found anything that comes close to what I'm trying to accomplish. Right now my URL's look like this: www.website.com/something which are using the root folder /index.php Now I have created plugins within folders: /plugins/PLUGINNAME/index.php I want to be able to have URLs like: www.website.com/plugins/PLUGINNAME/anything/iwant/here which are all using /plugins/PLUGINNAME/index.php and not the root directory index.php. Currently www.website.com/plugins/PLUGINNAME/ works, but anything after /PLUGINNAME/xxx defaults to the /index.php.

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• how to rotate one squid user among multiple IPs based on number of requests processed by each IP

  - by Arvind

  I want to set up a Squid ACL in the following manner-- For example, my Squid Proxy Server has 10 IP addresses- now I have a user 'demouser'. I want that for the very first request sent to 'demouser' this user uses IP address #1, for the second request it uses IP address #2, for the 3rd request of the day it uses IP address #3 and so on till it uses up all IPs. One more level of control I would like is that once the user has used up all available IP addresses once per address, then it does not allow the proxy request to go through. How do I set up such a configuration on Squid Proxy server ACL? Even a document or how to would be very helpful. The official wiki talks about one 'weird' case- choosing an IP address based on time of day the request was made to the proxy server. The other cases are all regular use cases which are not even remotely near my requirement as specified above.

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• Trouble configuring firewall for FTP on Windows Server 2008 R2

  - by x3ro

  Ok, I'm having the exact same problem as in this question http://serverfault.com/questions/59635/outbound-ftp-on-server-2008-r2-stalls but the accepted answer didn't help me much... I followed the third step of this http://learn.iis.net/page.aspx/309/configuring-ftp-firewall-settings/ guide in order to configure my firewall for FTP, and I am able to authenticate, however, the data channel doesn't seem to be passing through the firewall. If I disable the firewall, everything works fine. Hope someone can help me, as this is really starting to annoy me. Best regards, x3ro

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• VPN - Accessing computer outside of network. Only works one way

  - by Dan

  I could use some help here. My ideal goal is to create a VPN for 2 macs that are in different locations so that they can share each others screens and share files. I basically want to do what Logmein's Hamachi does, but without the 5 user limitation. I have set up the VPN on my Synology NAS at my house using the PPTP protocol. I could also use OpenVPN. The good news is that I can use a laptop outside of my home network to access any computer on my network at my house. The bad news is that I can not do the reverse. I want to use a computer in my home network (same network as the VPN server) to access a computer outside of my network (which is connected via VPN successfully). My internal IP is 192.168.1.xxx PPTP VPN assigns my laptop that is outside of my network with 192.168.5.xxx, but when I try to access it remotely either with afp://192.168.5.xxx or vnc://192.168.5.xxx I can't connect using either. Is this something that I should be able to do or is VPN only one way? I've also tried openvpn with the same results. Thanks for any help! -Dan

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• 3000 videos songs... some are loud in voice & some low.. I want to make them equal (equal in volume only)

  - by Mister.9

  I have thousands Video flv/avi files, which are all songs only. Some of them are high in volume and some are low. Every time the song ends I have to up or down the volume at once..to escape my ears ruined by headphones... and by woofers, save my life from my neighbor sleeping after hard-earning all the day long. :-( Any idea to make all files sound equal? Does such kind of application/software exist? Any converter that may convert all audio files into same volume? I know iTunes has sound-check option but can it convert? If I want to write CDs, does any burner have the feature like this, to burn in equal sound? If yes, suggest something for me... For, I am really really worried... It would be a great help..... Hoping your kind reply, Thanks in advance! (I am I am John.martin188@yahoo for having mails also in this regard)

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• Computer Won't Boot After New Power Supply

  - by Haxelgem

  I recently bought a Rosewill 750-M PSU to replace an Antec Earthwatts 500. My computer worked fine before making the switch. After installing the Rosewill PSU, I attempted to boot. Fans spun up for a second, then turned off. After a second, they spun up again and stayed on. However, I had no video output. I put the old Antec PSU back in, and still had the same problem. I put another GPU in the computer, trying both PSUs, and still nothing. I switched out the monitor also, which didn't work. What should I do?

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• Replace gvimext.dll in Windows 8

  - by Leftium

  How can I get the "Edit with ... using tabs" functionality in gVim on Windows 8 (64-bit)? I'd like to swap out gVim's stock gvimext.dll for one that adds an "Edit with ... using tabs" option to Explorer's right-click context menu. On Windows 7 (64-bit) I used to be able to download the DLL and swap it in by following these instructions. However, I can't get it to work in Windows 8. The stock installation's context menu (sans "... using tabs") works fine (without a restart) ...but after replacing the DLL the gVim context menu options disappear and the gvimext.dll no longer seems to even load. (Windows 8 was restarted) if I again replace gvimext.dll with a backup of the stock DLL, the context menu options remain missing and the DLL still seems to fail to load (Windows 8 was restarted, again) If I re-install gVim, the context menu items return (even without a restart) What is the difference here between Windows 7 (where swapping DLL's works) and Windows 8 (where swapping DLL's fails)?

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• Is WinRT really as secure as it's made out to be?

  - by IDWMaster

  Prior to releasing Windows 8, Microsoft claimed that all WinRT apps are cleanly removed from your computer after uninstalling them, and that WinRT apps should not interfere with other running applications, because they are ran in a "sandboxed" environment. Microsoft has also claimed numerous times on Channel9 that Windows 8 apps are not ran in a VM. So my question is; are these claims accurate? If the application is not running inside of a VM, how is it possible to protect the system against malicious code at runtime, assuming the attacker was able to bypass the screening process of the Windows Store system? Microsoft allows "native code" in WinRT apps, so wouldn't it be possible (using hand-coded assembly or some odd pointer manipulation trick to call functions outside of the sandboxed environment and interfere with the rest of the system, if it's really "native code" and not some VM?

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• Immersed versus 'normal' version of chrome

  - by Nanne

  I installed chrome, and now I have 2 ways to open chrome: if I open chrome from the metro-tile menu, I get the full-screen, immersed, windows-8 style chrome. If I start the link I got on my desktop, I get the windowed version. Apart from the fact that I would like to know how I might do that on purpose, I also want to know what's going on so I can use the windowed version (I prefer that for a browser) from all links I have, especially the one in the menu.

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• Windows 8 install fails

  - by HackToHell

  I have the windows 8 release preview 32 bit iso and it fails to install when booted out of a flash drive, it copies the files and the boot loader installs but the install hangs when I boot into Windows 8 the first time, it simply keeps on spinning forever. I did a vhd install of Windows 8 developer preview and it installed fine. Looking at the partition from Windows 7, I can see that the files are present.

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• Installing windows 8 into a new partition

  - by ACarter

  I've just gone through the Windows 8 upgrade process, and I am at the "Install now/Install by creating media/Install later from your desktop" stage. I've already got a sufficiantly big, empty partition, so can someone explain in fairly simple terms how to install onto the new partition? I would prefer not to burn the ISO onto a disk, it would be a lot easier if I could use a USB drive. (I've done quite a bit of googling, but all that I can find goes into endless detain about the partitioning, and spends very little time on putting the ISO on a booteable drive. How do I do this? Do I need to empty the drive? etc?)

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• Where can I get drivers for Windows 8

  - by Capt.Nemo

  I own a Dell Inspiron 1545, which came pre-installed with Vista. I upgraded to 7, and Dell made special windows 7 drivers available. I cannot seem to find any such special driver downloads for Windows 8. Is there any place I can check for driver updates, and be notified if and when they become available. The required drivers include: - Webcam - Alps Touchpad - Broadcom Wifi Of these, the webcam and wifi default windows drivers are working fine. However the touchpad configuration needs the official drivers.

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