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• How to know if my nginx is in good health?

  - by Howard

  I am running a nginx on EC2 (m1.small) for SSL termination. I am using 2 workers on Ubuntu, with latest nginx (stable), the network throughput is around 2Mbps and system load average is around 2 to 3. I am wondering if this system is in good health for now, e.g. what is the queue length (I know nginx can handle a lot of concurrent request, but I mean before the request is being served, how many of them need to wait before being served) what is the average queue time for a given request to be served. I want to know because if my nginx is cpu bounded (e.g. due to SSL), I will need to upgrade to a faster instance. My current nginx status Active connections: 4076 server accepts handled requests 90664283 90664283 104117012 Reading: 525 Writing: 81 Waiting: 3470

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• what to do when ctrl-c can't kill a process?

  - by Dustin Boswell

  Ctrl-c doesn't always work to kill the current process (for instance, if that process is busy in certain network operations). In that case, you just see "^C" by your cursor, and can't do much else. What's the easiest way to force that process to die now without losing my terminal? Summary of answers below: Usually, you can Ctrl-z to put the process to sleep, and then do "kill -9 process-pid", where you find the process's pid with 'ps' and other tools. On Bash (and possibly other shells) you can do "kill -9 %1" (or '%N' in general) which is easier. If Ctrl-z doesn't work, you'll have to open another terminal and kill from there.

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• Accessing non-port80 web server using IPv6

  - by logain

  In a normal IPv4 network, I can go into any browser such as Firefox and browse a server on a IPv4 address not hosted on port 80: (add http:// - Super user stops "new" users from adding links)192.168.42.6:8080/ This accesses the server on Port 8080 on 192.168.42.6. However, if I try this with a IPv6 IP, I get no luck. This tries to access port 8080 on fe80::520:ff0f:ece0:1 : http://[fe80::520:ff0f:ece0:1]:8080/ Firefox will automatically "fix" this URL to: http://[www.fe80::520:ff0f:ece0:1.com]:8080/ which does not help me access it at all. So either I am doing something really wrong OR there's something really wrong with IPv6. Couldn't find anything that even remotely helped on the Internet. (And yes, there is a server running on the IPv6 in question)

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• How to route traffic through a VPN tunnel?

  - by Gabriel

  The problem with our server is that we need to use the bug ridden and awful AT&T network client, which causes our server to bluescreen once per 24 hours. Does any one know how to (or has a good guide) quickly set up a workstation running Windows server 2008 R2 as a proxy server. So this spare workstation would run AT&T and would act as a bridge between our server and the server that can be connected to only via the AT&T VPN software. And this way our own production server would not crash so often (or not at all) and the workstation can happily crash whenever it wants to.

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• Recommended Tape Library Backup software

  - by D4

  Hi, I recently "inherited" a Tape Library (Powevault 136T / Scalar 100). and I was asking for some advise on the backup software to manage the Library. My goal is to be able to manage backups of all my servers (linux and Windows) and also backup VIP´s laptop computers over the network. I am hoping for a GUI application since I will not be the one managing the process after a couple of months... Any idea is more than welcome... thanks in advance....

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• Remote X-windows between new RHEL5 and old Solaris 8

  - by joshxdr

  I have a very small lab network with three boxes: a modern x86-based RHEL3 box, an x86-based RHEL5 box, and a 1998-vintage SPARC Ultra5 with Solaris 8. I can use ssh -X to run a program on the RHEL5 box and view the windows on the RHEL3 box. I believe this uses xauth and magic cookies?? I have followed the X-Windows HOWTO to set up xauth on the Solaris box, but so far no dice. I would like to be able to use the X-windows server on the RHEL3 box with a client program on the Solaris box (program running on Solaris host, windows appearing at Linux host). Is there a trick to this, or have I made a mistake following the instructions for setting up xauth and magic cookie?

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• estimating size of reply HTTP headers

  - by Guanidene

  I am trying to download a file via a basic socket connection, using a HTTP GET request. So, I have to specify how many bytes of data coming in I have to read from the socket. However, I am having trouble deciding the amount of data (say, in bytes) the server would reply back with. I know that there is a "Content-Length" field in the reply sent by server, but that gives me the size of the actual data (without the http headers). Is there a way to get the exact size of HTTP headers sent by the server or an estimation is required? (I am doing this for downloading on a mobile network, where every bit of data matters in terms of time and money, so I don't wish to make an unnecessary larger estimate of the header size.)

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• Asking for Credentials, when requesting shared folders on the server, regularly for domain users?

  - by MFH

  In our network, single domain controller, when some users (members of the domain) request shared folders on the server they are required to enter their credentials, the server is Windows Server 2008 R2, even checking to remember my credentials doesn't work, sometimes it shows this message: "The system has detected a possible attempt to compromise security. Please ensure that you can contact the server that authenticated you", sometimes it shows different messages, when I try to recreate the case sometimes I failed, I searched Google for it, I didn't find useful results, some talk about kerberos, but we don't use kerberos, this keeps going each day or two, how to overcome this, I don't want these messages to appear to users?

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• Windows 7 Ult machine can see XP Pro but not vice versa

  - by Chadworthington

  My new Windows 7 Ult. PC can attach to my work laptop and pull files but my work laptop cannot find my Windows 7 on the network. Is there some sort of limitation going on here? Before I got the new XP machine, my old XP Pro PC could pull files from the XP Pro laptop but not vice versa. The common thread seems to be that the work laptop cannot see other PCs, Windows 7 or not. Could it be because that PC is on a work domain? When I pull files from the work PC, I am prompted for domain credentials, which I provide.

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• windows 2000 freezing during large disk write

  - by robert

  We have a windows 2000 sp4 server which freezes up for about 1 minutes while its web-app does a ~500mb write operation. I can see the webapp start to do I/O activity (through process explorer) then the RDP session becomes unresponsive, you can click on windows and buttons but nothing happens. When the disk write finally finishes the session 'catches up' on all the mouse clicks you did during the freeze in a mad flurry of window activity and the server returns to normal. During the freeze the web-app stops as well. The same behaviour happens on the console of the server. (so I know its not a network thing) Nothing appears in the Event logs. Its like nothing happened. I have upgraded all the HP hardware drivers to the latest proliant support pack. And also run a HP hardware diagnostics which found nothing wrong. What would cause a disk write to lock the rest of the OS?

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• getting the following error in installing qt creator through software center

  - by I'll sudeepdino008

  getting the following error in installing qt creator through software center. The following packages have unmet dependencies: qtcreator: Depends: libqt4-help (>= 4:4.7.1) but 4:4.8.1-0ubuntu4 is to be installed Depends: libc6 (>= 2.15) but 2.15-0ubuntu10.2 is to be installed Depends: libgcc1 (>= 1:4.1.1) but 1:4.6.3-1ubuntu5 is to be installed Depends: libqt4-declarative (>= 4:4.7.4) but 4:4.8.1-0ubuntu4.2 is to be installed Depends: libqt4-designer (>= 4:4.7.1) but 4:4.8.1-0ubuntu4 is to be installed Depends: libqt4-network (>= 4:4.7.1) but 4:4.8.1-0ubuntu4.2 is to be installed Depends: libqt4-script (>= 4:4.7.1) but 4:4.8.1-0ubuntu4.2 is to be installed Depends: libqt4-sql (>= 4:4.7.1) but 4:4.8.1-0ubuntu4.2 is to be installed Depends: libqt4-svg (>= 4:4.7.1) but 4:4.8.1-0ubuntu4.2 is to be installed Depends: libqt4-xml (>= 4:4.7.1) but 4:4.8.1-0ubuntu4.2 is to be installed Depends: libqtcore4 (>= 4:4.8.0) but 4:4.8.1-0ubuntu4.2 is to be installed Depends: libqtgui4 (>= 4:4.8.0) but 4:4.8.1-0ubuntu4.2 is to be installed Depends: libstdc++6 (>= 4.4.0) but 4.6.3-1ubuntu5 is to be installed

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• scp to remote servers stalls, unable to isolate cause

  - by Rolf

  When I copy a large file (100+mb) to a remote server using scp it slows down from 2.7 mb/s to 100 kb/s and downward and then stalls. The problem is that I can't seem to isolate the problem. I've tried 2 different remote servers, using 2 local machines (1 osx, 1 windows/cygwin), using 2 different networks/isps and 2 different scp clients. All combinations give the problem except when I copy between the two remote servers (scp). Using wireshark I could not detect any traffic volume that would congest the network (although about 7 packets/sec with NBNS requests from the osx machine). What in the world could be going on? Given the combinations I've used there doesn't seem to be any overlap in the thing that could be causing the trouble.

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• Very slow accessing printer shared from Windows Machine

  - by Tarski

  Hello, How do I go about debugging a networking problem where the office printer is shared off a Windows XP PC and is very slow from me to access? Print/changing any settings can take several minutes and applications often display "Not Responding" in this time. My machine is a Windows Vista PC. The other PCs in the office are either Vista or XP and do not suffer from any printing problems. I am not experiencing any other network related problems, I can access the web and e-mail fine. The printer is a HP officejet Pro 8000

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• Window 2003 Server - Logon Failure error message in Event Viewer

  - by user45192

  Hi guys, I received alot of event logged in the event viewer with this message. I notice is always the same user id which encounters this error. The user id is use by an application to access the database. However, this account does not exits on this server. How do I trace the services/program use by this user id which causes these error messages? Reason=Unknown user name or bad password&&User Name=&&Domain=&&Logon Type=3&&Logon Process=NtLmSsp&&Authentication Package=NTLM&&Workstation Name=&&Caller User Name=-&&Caller Domain=-&&Caller Logon ID=-&&Caller Process ID=-&&Transited Services=-&&Source Network Address=-&&Source Port=-&&User=SYSTEM&&ComputerName=

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• Debian, CentOS, Slackware, FreeBSD, OpenSolaris and Ubuntu Server Edition: Which one to use for an http web server?

  - by Ako

  I am going to install and administrate a virtual server for a small university. The server should run inside a virtual machine (VirtualBox OSE). It is only used in the university network and is invisible to the outside world. It should run Apache web server for PHP, MySQL and probably a mail server. I don't know which OS to use. Main criteria for choosing include ease of administration and updating, package management and performance. I wonder if anyone has any suggestions? And candidate OSs are: Debian, Ubuntu, CentOS, Slackware, FreeBSD, OpenSolaris. Add any other OS if you know any better alternatives.

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• Is there any way to distribute x264 encoding jobs across multiple computers (to increase the encodin

  - by Breakthrough

  Does anyone know of a current, active solution to encoding x264 videos across many computers (via the network) to increase encoding FPS? I heard in the past of the project x264farm; unfortunately, it is not actively developed anymore, and isn't compatible with newer x264 builds. I'm looking for a current solution, which is compatible with newer builds of x264. Just to note this, I'm a Windows user, so I'm only looking for Windows solutions (or at the very least, Linux). I've also seen the ELDER distributed encoder, but the quality varies depending on the settings you use - I'd prefer a solution similar to x264farm as noted above (the documentation outlines the encoding process), but one that is compatible with new(er) x264 builds, and is preferably actively developed. Final Edit: Unfortunately, the bounty for this question has expired, and I haven't found a decent solution for this. So if at any time someone finds a new, distributed encoding solution for x264 (or any h.264 coded, for that matter) - please answer this question! I'd love to discover an ideal method to make this work!

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• VPN connects but my browsers and messenger don't connect

  - by elizabeth chubbuck

  I have no problem VPN into work. As of last night, everything worked fine. But as of this A.M., none of my browsers connect and Microsoft Messenger will not connect. I did nothing, but had a pending a OSX update. I rebooted.. Still no internet. All network connections working, clearly, since VPN works. Its how I am doing this post now, is via VPN and remote desktopping to work computer. This just showed up as of this morning not working. I renewed DHCP, etc.. but cannot ping anywhere.

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• Cannot connect to apache web server over internet

  - by user1658093

  I can access my apache 2.2 webserver from the lan ( at this case I use local IP aadress ) but I cannot connect externally ( from another network ). I changed apache to listen port 800, forwarded same port from router control panel, turned off windows and router firewalls. I use whatsmyip.com to get IP with what I try to connect. When I'm trying to connect I use : [whatsmyip.com IP]:800. Also, I can ping server IP externally. OS is windows7. Any ideas, suggestions? Thanks

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• Samba domain trust errors on a specific interface

  - by John K

  We have a windows domain that also has RHEL member servers in it. All the servers have a primary network connection to the LAN, but some servers also have private dedicated links to one of our RHEL servers, which serves as a head to our SAN storage. This particular server is running Samba 3.5.15, and is running in domain authentication mode. Users can access shares on this server without a problem over the LAN connection from our Windows servers, but if a user tries to access the shares over a private link (i.e. a 192.168.1.2 address to the RHEL server) users get an error "The trust relationship between this workstation and the primary domain failed."

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• Why can my Mac not connect to my iPhone via ssh?

  - by martin08

  I couldn't always ssh to my iPhone from my Mac. They're both on the same wifi network but sometimes the connection is established, sometimes it failed. From my Mac: $ ssh [email protected] ssh: connect to host 192.168.0.102 port 22: Operation timed out $ ping 192.168.0.102 PING 192.168.0.102 (192.168.0.102): 56 data bytes ping: sendto: No route to host ping: sendto: Host is down ping: sendto: Host is down I enabled SSH on the phone and am sure it can load webpages. So what might be a reason why they cannot connect? Thanks

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• Unable to connect to remote MS SQL Server 2008 Express SP3 instance by name

  - by Max

  I am trying to connect to a remote MS SQL Server 2008 SP3 x86 Instance using it's name. At the first glance all seems to work well (e.g. it is possible to connect to the server locally and succesfully telnet it's port remotely), but there is a thing I can't understand... This line should connect us to the default instance of remote SQL Server: osql -S ServerIP -d MyDatabase /U sa -P MyPassword and it does the trick, however the next one: osql -S ServerIP\MyInstance -d MyDatabase /U sa -P MyPassword ends up with the following error: [SQL Native Client]SQL Network Interfaces: Error Locating Server/Instance Specified [xFFFFFFFF]. [SQL Native Client]Login timeout expired [SQL Native Client]An error has occurred while establishing a connection to the server. When connecting to SQL Server 2005, this failure may be caused by the fact that under the default settings SQL Server does not allow remote connections. The only instance running on the server is MyInstance, which is (I guess) the default one. Could you please put some time in explaining the issue.

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• Setup IPv6 over IPv4 tunnel in VPN

  - by bfmeb

  Let me explain my szenario: I have a linux server A. A is reachable in a VPN. So if I am connected to the VPN over Internet I can successfully ping A. Server A is connected to a Router B. Router B has a local ipv6 address and there are resources (each of them with a local ipv6 address) connected to Router B. After I am connected to VPN, I am able to use ssh to have access over A. Now I can use the ping6 command to ping the Router B or one of its connected resources. This works fine. The ping fails if I try to ping router B on my computer. Overview: My Computer -- VPN -- Server A(ipv4) -- Router B(ipv6) -- Ressource A(ipv6) On resource A runs for example a HTTP-Server. My question is: How can I access Resource A (for example with HTTP) on my to VPN connected computer? Is it possible? Should I setup a tunnel device? Sorry for this inexpertly explanation, but I am new to network stuff!

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• How do sites avoid SEO issues / legalities with subdomain unique ids?

  - by JM4

  I was looking through a few websites recently and noticed a trend I'm not sure I understand. Sites are creating unique referral URLs for customers in the form of: http://customname.site.com (If somebody were to use http://www.site.com/customname it would function the same way). I can see the sites are using 302 redirects at some point using Google Chrome then doing some sort of htaccess redirect, taking the subdomain name (customname) and applying it as a referral parameter then keeping in session during the entire process. However, there must be thousands of these custom URLs that people are typing in. How are each one of these "subdomains" not treated as separate URLs which in turn are redirected to the same page (in short, generating tons of links all pointing to the same page which Google would normally frown upon)? Additionally, the links also appear on the site themselves as clickable links so I'm not sure how these are not tracked. Similarly, the "unique" url is not indexed or cached in any Google search results. How is this capability handled? It does NOT highlight the referral aspect, but a true example of this is visiting http://sfgiants.com which does a 302 redirect to the much longer proper San Francisco Giants MLB homepage. I am wondering how SFgiants.com is not indexed (assuming that direct shortened link appears on several MLB pages)? 1 - I know these are 302 redirects, I can see this on the sites network flow. 2 - These links do in fact appear on the page itself because in some areas (for example, the bottom of the page may say: send this page to a friend! http://name.site.com/ which in turn would again redirect to something like http://www.site.com?id=name so the id value could be stored in session

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• Windows Server 2008 Static IP Address

  - by Gauls

  I have Win 2008 Server VM and want to set static IP address so that i can RDP into instead of using VM player (mouse gets out of focus as the size of the VM increases). Now while making the changes i see two TC/IPv6 and TC/IPv4 i try changing the IPaddress from obtain autimatically, but it always goes to "Unidentified Network". If i leave it to automatically obtain IP,i still cannot RDP into it. I have tired disabling TC/IPv6 from reistry. Any other suggestions? BTW the same setting works fine with WIN XP and i can RDP into all Win XP VM's Cheers Gauls

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• Unable to remotely schedule tasks from the command line

  - by Eptin

  I'm on a Windows 7 machine, attempting to use the command line to schedule a task on another Windows 7 machine in my company's network. I have administrative-level credentials for both computers. With help from http://msdn.microsoft.com/en-us/library/windows/desktop/bb736357.aspx I have created this line to run on the command prompt: schtasks /Create /S machinename /U username /P password /SC ONCE /TN Test1 /TR C:\Windows\System32\calc.exe /ST 16:30 Whenever I launch that, I get the following error: ERROR: User credentials are not allowed on the local machine. How can I fix this?

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