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• UAE and the mysteries of unreachable websites

  - by 0plus1

  I write here because I'm really lost, please stay with me because it's not easy to explain. A company asked me to set-up a private server, now I'm a programmer so I got a solution with technical support and cpanel which helped me to setup everything and it's working smoothless. I'm by no means a professional sysadmin, but I have a fair knowledge of server configurations, but this problem is way over my knowledge, and apparently way over the knowledge of most sysadmins, I really hope that here I'll find someone with enough experience to help me or at least give me more insight. Now this company for which I'm consulting operates in the UAE (United Arab Emirates) and from there the server is almost unreachable. It started with ns not registering in the UAE, after a week that sorted itself out and now the site is indeed reachable, but it takes almost 2 minutes to load a webpage with one line of text. Emails go in timeout. The domain currently parked there has been bought appositely for tests, the main one that was supposed to go there, after a catastrophic week has been transferred to a shared hosting solution in the UK, and from there it works like a charme. Now after doing some research I discovered that I'm not alone in this, there are several reports of webmasters discovering that their website is not reachable inside the UAE, and mind this has nothing to do with the state-wide block of questionable sites, because in that case an error message appears, this seems to be related to the infrastructure of the UAE, which apparently reroutes everything through their own "fake" internet. Apparently new servers with their own IP are not recognized (yet?) by the UAE infrastructure, while shared hosting solutions seeing that they operates tons of other websites are more likely to be part of the UAE network. Now my questions are: 1) Has someone a real explanation for this? The only thing I can think of is that the server is on a new IP that is not yet recognized by the UAE, but that doesn't explain why it loads (even if after 2 minutes). I don't have any help from within the UAE as the only people that are "experts" are questionable companies that simply try to sell their own services. 2) If there is really some kind of block of new servers, is it possible to know before if a server is reachable from within the UAE, currently this is not a ns problem as even accessing the server with its IP result in a 2 minute wait. 3) Can it be that the problem lies somewhere else? There are some tests that I can perform? I'm not physically in the UAE, but I can ask the people there, or use teamviewer. Could it be some misconfiguration on the server (mind that the site works EVERYWHERE else in the world). Thank you for ANY kind of help

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• Web Service gets unavailable after several concurrent calls

  - by Roman

  We are testing GoDaddy Virtual Data Center and came to a very strange issue when our web site gets unavailable. GoDaddy Support keeps saying the issue is in our web server settings, but looking at the result of our tests I doubt it. TEST ENVIRONMENT Virtual DataCenter with Windows hosted at GoDaddy.com. All servers have Windows Server 2008 R2 Datacenter, IIS 7. Server One with IP address 10.1.0.4 Server Two with IP address 10.1.0.3 Both servers are in private network not visible from outside. Port Forward with IP address 50.62.13.174. Port Forward is assigned to Server One TEST DESCRIPTION JMeter is used as a Client App to simulate 30 concurrent users sending 100 SOAP requests each. Interval between requests is 1 second. Http link used for testing: http://50.62.13.174/v2/webservices.asmx TEST ONE Test is run from a computer in our office. After JMeter starts running test, almost immediately, the link above becomes unavailable in a browser. After test completion, the link is not available in a browser for about 5 more minutes. Remote Desktop is working well, so we can connect to Server One remotely. After about 5 minutes since test completion, the link becomes available in a browser again. TEST TWO Test is run from Server Two (that is part of our virtual data center). Test works very well, no visible delays in processing. The link is available in a browser all the time. TEST THREE Test is run from Server One using localhost. The result is the same as in TEST TWO - no issues. TEST FOUR We repeated TEST ONE from other computers that we have located in different countries, all with the same result as TEST ONE. CONCLUSION As the test works well from Server Two, but does not work from outside our virtual data center, we feel there are issues with the network or its capacity. The whole behaviour looks like out requests from outside get stuck somewhere before reaching our virtual data center. Has anybody had similar issues in the past? Are there chances that something is wrong with our server settings?

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• Why are .local and .arpa DNS queries showing up outside my network on OpenDNS?

  - by Baodad

  We have a Windows office network with a local Actice Directory/DNS domain server. The server is set up with OpenDNS's servers as forwarders (see screenshot). However, when I look at my OpenDNS query statistics, I notice that the 3rd most popular query is *.in-addr-arpa, and the 12th is *.local which is from our local domain. Should I, or how can I prevent these local queries from going beyond my local network?

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• Weird IIS with Windows Authentication + IE problem

  - by Paulius Maruška

  Hello. I have a website running on IIS and using Windows Authentication. All users that are configured to get access to the site are form a AD domain (not local users). In the properties of a Website, I have set to use the AD domain as the realm. Now, when using Firefox, Safari or Chrome - Everything is fine. When the user tries to open the site, he get's the login box. he enters simply "username" and "password" (let's pretend that it's an actual login and password :P) and he get's into the site. When using IE, however, things get nasty. When the user tries to open the site - he get's the login box. User enters the "username" and "password" again, but those get rejected! And when the second time login box pops up - it has the username filled in as "web-server-domain-name\username" which is wrong, because web-server-domain-name is not the domain where all users reside (it's "ad-domain"). I've spent days trying to figure out what's going on... Note, that if I manually enter "ad-domain\username" - I get accepted into the site without problems. So, my guess is that IE sends wrong username if domain is not specified. Anyway, IE is the only browser that triggers this behavior! Is it possible to do a server-side fix? Maybe it's possible to somehow auto-map the users to AD users? If it's not solvable server-side - is there a client-side fix for this? Thank you. PS: I'm more of a programmer than a sys-admin, so configuring servers isn't the strong side of mine... :P UPDATE: @Evan: Yes, "Digest authentication for Windows domain servers" is also enabled. @Eric: IIS version is 6.0. The authentication methods enabled are: Integrated and digest - all other methods are disabled. As for the security log. I looked at it, when doing "username" and "password" login in Chrome/Firefox and when doing "ad-domain\username" and "password" login from IE - the generated log messages are the same (I see no difference, anyway). When entering "username" and "password" I don't see any errors in the security (or any other) log, so can't tell what method it's trying to use. UPDATE 2: As suggested by Eric in the comments - I played around with Fiddler... While playing with it, I noticed, that when "username" and "password" is entered in FF and IE - the "Authorization" header value (encrypted) sent by IE is longer (almost two times) than one sent by FF. I tried to disable Windows Integrated authentication and only leave the Digest enabled - that fixed the problem (meaning, IE used the right realm just like other browsers), but that caused bazillion other problems with my site, because with Digest - user impersonation on the server doesn't work (that causes problems, when connecting to database etc). Any ideas?

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• Vserver still interesting ?

  - by Kartoch

  I was using Vserver a long time ago. But since the last stable release (2007), BSD jails are offering many more functionalities. It is not clear if Vserver has still a future (still some development on it). have you dump (ou keep) vserver for your production servers ? For which reasons ?

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• Looking for a NTP Server Software for Windows

  - by Simon

  I'm looking for a, preferably free, NTP Server for Windows Server 2003/2008. We have already tried the built in Windows Time Server, but our tests did show that it is not very accurate, we see time differences up to 500ms. The max time difference we can allow for our application is ~100ms. Now we have already used the Meinberg NTPd for Windows. It works great except we have one big issue with it: If there is a network connection problem between the client and server, the ntp server is in a panic state It won't give the client a new time until we restart the ntp service. This is a big issue which has caused us some trouble. It was working fine for months until there was a network problem we didn't notice, we only noticed it after a week when the time difference was already 30 sec. on the clients. So please suggest some alternative NTP Server for windows. I did Google but I get a lot of unrelated search results. Edit: So far the ntpd windows version was very accurate and I'd like to stick with it. The only problem is the "panic state" after a network disconnect. Maybe some knows here what the cause of this is and how to fix it. Also, I forgot to mention that we have a server/client setup like this: Server1 -- Server2 -- Server3 -- Client1 -- Client2 -- Client3 So Server2 gets its time from Server1, Server3 gets its time from Server2, and the Clients get their time from Server3. Also, there are clients connected directly to Server2. It is important that all Servers and Clients have the exact same time (within ~100ms) Now there was a network problem with Server3 and its clients. The servers run the ntpd port for Windows, which acts as NTP server and client. The clients have Dimension4 as NTP client. After the network problem, the error message in D4 was something like this (out the top of my head, don't have the exact error message): Server response: The server is in a panic state (could not sync clock) I read through the ntpd docs, and the only mention of "panic" is when the time difference is 10000 seconds which will cause to exit the ntpd server but this was not the case. Also there is a "-g" command line switch to disable the panic exit, but it is already set by default. Any ideas what could cause the panic state and how to get rid of it next time?

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• nginx: delay sending proxy request through?

  - by user41356

  I'm set up nginx to proxy requests to a pool of web servers. I'd like nginx to limit the number of concurrent requests to each web server, by waiting to forward the request, so that a web server isn't overwhelmed. Is there a way to do this in nginx?

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• Sourcing local .bashrc .vimrc without copy to remote machine

  - by David Strejc

  Does anyone have an idea or hack on how to source my local dotfiles (I will probably need more of them so this solution should work with many files) on remote machines without scp them to remote machine? Is something like scp .bashrc to /tmp folder on remote machine and then exporting BASHRC env variable the best solution? I need this because of our company policy and fast cloud servers deployment and redeployment and I don't want to touch .bashrc files on remote machine so my colleges are able to use their default env which doesn't suit me.

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• Nginx Ip Whitelist

  - by Will

  Is it possible to create a ip whitelist for my nginx proxy server without adding allow or deny in the config file is it possible i can get nginx to link to a separate database to check if the user is allowed to access the website . Ideally i could do with nginx linking to an external database or at minimum a list off allowed ips on the same server so i can easily update the list whit out restarting nginx every time. In the future i would like to link nginx to my website and a user will login and there ip will be linked to there account and they will be able to update there ip if it has changed to there new one to grant them access so i need to keep in mind that it would be easyer to do this if i have external list off ips in some kind off database any help is apreshiated

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• Mail.app Bug -- Keeps Showing Messages

  - by yodie

  Hi, I'm running Mail.app on my Mac (Snow Leopard). Two GMail accounts are linked to it using POP. There is an annoying bug which causes certain messages from one of the account to show up in my Inbox. They are always messages I sent to a certain account, and are 6-7 messages from one thread. If I delete them, they just show up again if I restart Mail.app or switch to a different mailbox and back, although the number of messages goes down, until it reaches one, and goes back to six-seven. The only solution I have found is to delete the offending thread from within GMail, except that then another thread takes its place and starts annoying me. Any solution?

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• Linux IO monitoring per file?

  - by MattK

  I am interested in a utility or process for monitoring disk IO per file on CentOS. On Win2008, the resmon utility allows this type of drilldown, but none of the Linux utilities I have found do this (iostat, iotop, dstat, nmon). My interest in monitoring IO bottlenecks on database servers. With MSSQL, I have found it an informative diagnostic to know which files / filespaces are getting hit the hardest.

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• How can I restart yum?

  - by Rob

  on my server, yum is using a LOT of system resources. My friend suggested to kill -9 it, but I want to know I'll be able to restart it first. Preferably without rebooting the whole server. However, I'd also like some alternatives, I'd rather know WHY yum is taking up all these resources. I'm fairly new to running servers, so I'd appreciate any help.

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• Slow ASP.NET site using IIS6

  - by lars

  Hi, I have two servers, one virtual and one physical, running the exact same site on both machines. Both machines are running on ~ 2% CPU load and very much RAM available for usage. Somehow the site, with cache turned off ofcourse, loads in ~ 500ms on the virtual machine (which is a dev-server by the way) but almost 3 full seconds on the physical machine. They're both running Server 2003, IIS6 aswell as asp.net version 2.0 Any ideas where I can start troubleshoot this? Best Regards LP

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• How to get more information from the system crash

  - by viraptor

  I'd like to debug an issue I'm having with a linux (debian stable) server, but I'm running out of ideas of how to confirm any diagnosis. Some background: The servers are running DL160 class with hardware raid between two disks. They're running a lot of services, mostly utilising network interface and CPU. There are 8 cpus and 7 "main" most cpu-hungry processes are bound to one core each via cpu affinity. Other random background scripts are not forced anywhere. The filesystem is writing ~1.5k blocks/s the whole time (goes up above 2k/s in peak times). Normal CPU usage for those servers is ~60% on 7 cores and some minimal usage on the last (whatever's running on shells usually). What actually happens is that the "main" services start using 100% CPU at some point, mainly stuck in kernel time. After a couple of seconds, LA goes over 400 and we lose any way to connect to the box (KVM is on it's way, but not there yet). Sometimes we see a kernel reporting hung task (but not always): [118951.272884] INFO: task zsh:15911 blocked for more than 120 seconds. [118951.272955] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [118951.273037] zsh D 0000000000000000 0 15911 1 [118951.273093] ffff8101898c3c48 0000000000000046 0000000000000000 ffffffffa0155e0a [118951.273183] ffff8101a753a080 ffff81021f1c5570 ffff8101a753a308 000000051f0fd740 [118951.273274] 0000000000000246 0000000000000000 00000000ffffffbd 0000000000000001 [118951.273335] Call Trace: [118951.273424] [<ffffffffa0155e0a>] :ext3:__ext3_journal_dirty_metadata+0x1e/0x46 [118951.273510] [<ffffffff804294f6>] schedule_timeout+0x1e/0xad [118951.273563] [<ffffffff8027577c>] __pagevec_free+0x21/0x2e [118951.273613] [<ffffffff80428b0b>] wait_for_common+0xcf/0x13a [118951.273692] [<ffffffff8022c168>] default_wake_function+0x0/0xe .... This would point at raid / disk failure, however sometimes the tasks are hung on kernel's gettsc which would indicate some general weird hardware behaviour. It's also running mysql (almost read-only, 99% cache hit), which seems to spawn a lot more threads during the system problems. During the day it does ~200kq/s (selects) and ~10q/s (writes). The host is never running out of memory or swapping, no oom reports are spotted. We've got many boxes with similar/same hardware and they all seem to behave that way, but I'm not sure which part fails, so it's probably not a good idea to just grab something more powerful and hope the problem goes away. Applications themselves don't really report anything wrong when they're running. I can run anything safely on the same hardware in an isolated environment. What can I do to narrow down the problem? Where else should I look for explanation?

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• What are the strengths of OpenSolaris compared to Linux?

  - by netvope

  Please try to answer in these areas: For what kind of usage is OpenSolaris more suited than Linux? What are the useful OpenSolaris features that Linux lacks? Personal experiences are welcomed, but please don't start a flame war. Strengths of Linux over OpenSolaris are beyond this topic. (For Linux, I'm thinking of something like Ubuntu or Fedora, but not RHEL, if that matters.) (I have used Linux servers for a long time but have never used Solaris, if that matters.)

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• Suggested managed DNS provider?

  - by Arelius

  We own/manage a few domains (nothing too large or too trafficked). Currently our DNS servers are hosted onsite. For ease of management and lower-latency DNS requests we are interested in moving our Domains offsite, does anyone have recommendations for a good DNS provider?

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• Recommendations on managing dot files for users using Puppet

  - by Beaming Mel-Bin

  Goal is to have a collection of dot files (.bashrc, .vimrc, etc.) in a central location. Once it's there, Puppet should push out the files to all managed servers. I initially was thinking of giving users FTP access where they could upload their dot files and then having an rsync cron job. However, it might not be the most elegant or robust solution. Wanted to see if anyone else had some recommendations.

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• TTL for PTR records on Windows 2003 Server DNS

  - by Kyle Brandt

  When I look at the TTL (Time to Live) for PTR records (Reverse Lookup Zone) on one of our Windows 2003 DNS servers I see some are at 15 minutes, others are at 20. They have "Delete this record when it becomes stale" checked. These PTR records are for workstations that get IPs from Windows DHCP, so I think that creates the PTR records dynamically? How is TTL for these records set?

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• MPD - Streaming Internet Radio

  - by user98496

  I use mpd on 3 Ubuntu servers at home. Apparently, if you take a .pls file and convert it to a .m3u file, you can stream it as long as you put is in the designated mpd playlist directory. In my case, the path to that directory is /var/lib/mpd/playlists. When I move the converted file to this directly, even though the mpd client recognizes the saved .m3u file, it won't play it. Does anyone have experience with this function of mpd?

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• curl installation and upgrade

  - by user26202

  On a centos 5.7 machine we had curl 7.15 installed . We also have PHP installed in it as some of the PHP libraries are linked to curl. We wanted to upgrade curl to 7.19 but yum update was failing . Then we manually installed 7.19 with the sources. Now we have two curl versions /usr/bin/curl points to 7.15 /usr/local/bin/curl points to 7.19 And PHP still uses curl 7.15 .How to do delete curl 7.15 without removing the dependency (like PHP and make PHP start using curl 7.19?

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• I need to set-up the blocked machine to relay to the unblocked machine using a different port

  - by Zain Ally

  I have two Windows Server 2003 machines sitting in a network. Server B has port 25 open and can relay emails to the local network's smtp server. Server A does not have port 25 open. How can I set it up to send emails through another port to the SMTP server? I am thinking if I can setup a local SMTP communication between my servers on a different port and let Server B send Server A's emails. Is that possible?

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• Cropped thumbnails in WordPress

  - by codethief

  Quote from Wordpress' image editor: The thumbnail image can be cropped differently. For example it can be square or contain only a portion of the original image to showcase it better. Here you can select whether to apply changes to all image sizes or make the thumbnail different. This is exactly what I'd like to do, except for the fact that I don't want Wordpress to scale it down to 150x150 pixels (or another predefined resolution). I'd just like to display a cropped (and therefore smaller) version of the picture which is then linked to the (uncropped) original. I also tried to set the thumbnails' width and height to 0 in the preferences. Then, however, I don't even get the chance to assign a cropped version as thumbnail in the editor. Could you tell me how to achieve that? Or isn't it possible at all?

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• What to use for server and network documentation? Must run on Linux.

  - by Louise Hoffman

  Does anyone know of a good program, web service, or CMS for documenting servers, IP addresses, logins, and network? Only requirement it must run on and from Linux.

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• Which free VNC server works well with Windows 7 and how to advertise it via Samba for control by a M

  - by GJ

  Hi I need to control a Windows 7 PC via VNC from a Mac in an office LAN. Since the IPs are dynamically assigned, I'd like the PC to appear in my "Places" and in the automatically detected nearby servers in VNC client I'm using -- both of which require the PC to advertise its VNC server via Samba (right?). I tried installing ultravnc, which works when I access it directly by IP, but it doesn't seem to advertise itself in the network. Any ideas?

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• Creating url from the cloudfront aws

  - by GroovyUser

  I have my js files which I have uploaded into the Amazon S3 and linked it with the Cloudfront. I got a url something like this : dxxxxxxxx.cloudfront.net But opening that url in my browser ( I'm getting an error ) : <Error> <Code>AccessDenied</Code> <Message>Access Denied</Message> <RequestId>xxxxxx</RequestId> <HostId> xxxxxxxxxxxxxxx </HostId> </Error> But what I want actually is to use the url and add them to my webpage. How could I do that? Thanks in advance.

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