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• Unable to telnet out on port 25 on windows server 2008

  - by NickGPS

  Hi All, I just setup a Windows 2008 R2 server and am trying to get a basic mail server up and running so that I can send emails from my applications. I setup a virtual SMTP server in IIS6 and tried doing a local telnet to port 25, which seemed to work fine. There were no errors during this stage and I can see the mail message appear in the Queue folder. The problem is that mail never leaves the Queue folder. I then tried to telnet to a remote mail server on port 25 but couldn't connect:- telnet 209.85.227.27 25 Could not open connection to the host, on port 25: Connection failed) I checked my firewall and there is a default setting to allow all outgoing TCP traffic with no restriction. I even setup a specific rule for outgoing port 25 traffic but to no avail. I then ran a SmtpDiag.exe command .\SmtpDiag.exe [email protected] [email protected] and received the following output Searching for Exchange external DNS settings. Computer name is WIN-SERVERNAME. Failed to connect to the domain controller. Error: 8007054b Checking SOA for gmail.com. Checking external DNS servers. Checking internal DNS servers. SOA serial number match: Passed. Checking local domain records. Checking MX records using TCP: gmail.com. Checking MX records using UDP: gmail.com. Both TCP and UDP queries succeeded. Local DNS test passed. Checking remote domain records. Checking MX records using TCP: gmail.com. Checking MX records using UDP: gmail.com. Both TCP and UDP queries succeeded. Remote DNS test passed. Checking MX servers listed for [email protected]. Connecting to gmail-smtp-in.l.google.com [209.85.227.27] on port 25. Connecting to the server failed. Error: 10060 Failed to submit mail to gmail-smtp-in.l.google.com. Is there any other diagnostics I can do to figure out if it's my firewall or something else? I have removed antivirus to make sure that it wasn't causing the problem. Any ideas would be much appreciated.

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• nginx timeout albeit ridicolous configuration

  - by Joa Ebert

  The scenario is an API server that should handle uploads. Posting on my.host.com/api/upload should do something with the body the client sends. However the API server has been designed to block the whole request until it fully processed the file, including some analysis which can take up to approx. 5min (...!). This has to change of course. In the meantime I wanted to setup nginx as a load balancer in front of the API servers. I quickly ran into a timeout issue, consulted Google and came up with this ridiculous test configuration: user www-data; worker_processes 4; error_log /var/log/nginx/error.log; pid /var/run/nginx.pid; events { worker_connections 1024; } http { include /etc/nginx/mime.types; access_log off; sendfile on; send_timeout 3600; keepalive_timeout 3600 120; tcp_nopush on; tcp_nodelay on; gzip off; client_header_timeout 3600; client_body_timeout 3600; proxy_send_timeout 3600; proxy_read_timeout 3600; proxy_connect_timeout 1800; proxy_next_upstream error; include /etc/nginx/conf.d/*.conf; include /etc/nginx/sites-enabled/*; } And upstream test { server host1; server host2; } server { listen 80; server_name my.host.com; client_max_body_size 10m; location /api/ { proxy_pass http://test; proxy_set_header X-Real-IP $remote_addr; proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for; proxy_set_header Host $host; proxy_redirect off; } } Still, when an upload happens, I get the following result in the error.log: 2010/12/22 13:36:42 [error] 5256#0: *187359 upstream timed out (110: Connection timed out) while reading response header from upstream, client: xx.xx.xx.xx, server: my.host.com, request: "POST /api/upload HTTP/1.1", upstream: "http://apiserver:80/upload", host: "my.host.com" What else could I do? If I look at the log of the API server I still see that it is processing the request and analyzing the file. But I think 3600 seconds as a timeout should be more than enough. This happens even after a could of seconds. And I did a reload and force-reload of the configuration as well of course.

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• Vista stuck at "Shutting down..." screen. Any way to get verbose logging?

  - by CapBBeard

  Hi all, My home machine has been running fine for about 3 years, no problems at all. Within the last couple of weeks it's had real trouble trying to shut down. It'll get so far and then just sit there at the "Shutting down..." screen for hours. I've left it overnight, I've tried in safe mode, all to no avail. These days, I just wait for the disk activity to finish up and then hold the power button to turn it off. Feels dirty as, especially because there's a RAID involved! The hardware itself is in pretty good shape and of decent spec; Core 2 Quad, 4GB RAM, 1TB RAID 1+0, so it's not quite like a 7 year old PC coming to end of life! In the last month, hardware hasn't changed except for a new monitor. Admittedly I haven't tried unplugging the monitor but I've never heard of that preventing a shutdown. I might give it a whirl later I guess, as a last resort. I've uninstalled old apps, done updates, checked the event log, looked in device manager, uninstalled all non-present devices, disabled various non-critical devices (imaging, audio etc), unplugged peripherals, stopped non-essential services, unplugged the network, disabled the network adapter entirely, ran chkdsk, verified my RAID, the list goes on. But not a single lead. I'm pretty stumped. It could be hardware, but I have no other evidence to suggest so; when the PC is running, it runs fine. Temperatures are good, gaming is smooth as always, disk performance is fine. Event log even makes it look like the shutdown was completed (gets to the point where the event log service stops). In fact, the PC doesn't appear to realise that I cut the power to it. So my question is, does anyone know if there is a way I can get some verbose output (or a log) from shutdown to give me some idea of what is causing the issue? I'm guessing it's stuck unloading some app/driver but it would be good to get some specifics! Unless anyone has any other ideas? I suspect a reinstall would resolve the issue, however I'm looking to get a new PC built in the next month or so, and the reinstall is going to be quite a big job so I'd rather just wait until then if it comes to that. Would still be nice to get this sorted in the mean time though. Cheers!

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• Windows 7 Home hangs at "Welcome" screen

  - by White Phoenix

  I'm asking on behalf of a friend who's currently having problems with his machine. Windows 7 Home 32-bit. He's too far away for me to help by going over to his house - I'm helping him over the Internet. This is his current machine: http://www.newegg.com/Product/Product.aspx?Item=N82E16883227134 The only two changes he made to that machine is to swap out the gfx card for a EVGA GTX 460 and the PSU for a Corsair TX650. Here's what happened: He was playing a computer game (fairly CPU/GPU intensive) and had some music going in the background in foobar while playing. Suddenly, he notices the music stopped playing, so he switches to foobar to try to close it, but it freezes up (window won't respond). So he figures it's just foobar having a bad day and force quits that program. Suddenly, his game won't respond, so he force quits that, then the entire computer just went to crap at that point, so he hits the restart button on his machine. Computer POSTS fine, but now he gets stuck at the Windows "welcome" screen (his account is set to auto-login). HD activity light is solid yellow but he doesn't hear HDD activity. He tried booting into Safe Mode - gets stuck at the "welcome screen". Tried a STartup Repair within Windows 7, it found a few problems, but still gets stuck at welcome. I advised him to boot off the DVD - sfc /scannow found nothing (couldn't use the regular /scannow option; says there's a repair pending, had to use use offbootdir/offwindir command switches). Ran startup repair 3 times - found nothing. My friend runs virus/malware scans on a regular basis, so he's fairly sure it's not that either. Right now I'm having my friend run chkdsk /R on the computer while in this Startup Recovery mode - so far it's caught a few bad sectors. However at this point I'm kinda wondering which way to go if chkdsk doesn't fix it. Quick Google search said someone had success by booting Windows with bootlogging on - some others have success with running the aforemented chkdsk, etc. The fact that Windows cannot even boot into Safe Mode concerns me. While we're waiting for chkdsk /R to finish, are there any other options I can give my friend short of reinstalling Windows 7? He has his data on a separate partition so that's not a major problem (though it'll be an annoyance for him). I suspect his hard drive may be having some issues, but my main concern is getting him back up and running before we start diagnosing the hard drive (I may have him run some sort of SMART test utility later).

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• VMware server 2.0 SYN/ACK repeating issues

  - by user65579

  VMWare Server 2.0.0 Build 122956 I am having some issues with connecting into a guest VM (Ubuntu linux 4.4.3-4 lucid) running under VMware 2.0 on a windows server host. All connections to and from the VM's work fine, except for FTP. I thought the issue was the FTP daemon at first but it has been ruled out that it is not the daemon or the server itself. When you try to connect to the FTP server from outside of the host OS it fails with a "421 Service not available" but when you try and connect from the local VM or from the host OS the connection goes through fine. I have ran many packet sniffs using wireshark/tcpdump from the VM, the host OS, and the client connecting, the most informative is the host OS. I have attached a PNG of the relavant packets that were captured. I viewed some other network traffic that was sniffed (WWW specifically) and it seems to do the same syn/ack repeating but the user doesnt see any issues. I have disabled the firewall and the issues persisits, I have tried with specific allow rules to ensure the data is allowed and no changes. It appears like VMware attempts to do the ICMP redirect and it works, but then it vmware repeats the packets sent so you get 3 syn/ack's for every one syn from the client. Also VMWare appears to be attempting to establish an FTP connection between the HOST OS and the GUEST OS, because I see the second SYN sent from the HOST OS to the GUEST to initiate a new connection, and it get the appropriate SYN/ACK followed by an ACK, but the client never sees any of this from its end. EG. syn from client syn/ack from host OS to client syn/ack from guest OS to client syn/ack from host OS to client The same thing happens when the connection reset is attempted, RST's start being sent and repeated, the server responds with a valid header to continue the FTP handshake but the RST acknowledgement is allready issued and things are closed. I am not 100% if this is a bug in VMware or possibly a VMNetwork missconfiguration. Does anyone have any thoughts on where exactly the issue could be, things to try to verify or rule out? I have linked to a picture of the relevant packets sniffed from the host OS. http://img18.imageshack.us/img18/7789/vmwareftpconnection.jpg

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• Secure, efficient, version-preserving, filename-hiding backup implemented in this way?

  - by barrycarter

  I tried writing a "perfect" backup program (below), but ran into problems (also below). Is there an efficient/working version of this?: Assumptions: you're backing up from 'local', which you own and has limited disk space to 'remote', which has infinite disk space and belongs to someone else, so you need encryption. Network bandwidth is finite. 'local' keeps a db of backed-up files w/ this data for each file: filename, including full path file's last modified time (mtime) sha1sum of file's unencrypted contents sha1sum of file's encrypted contents Given a list of files to backup (some perhaps already backed up), the program runs 'find' and gets the full path/mtime for each file (this is fairly efficient; conversely, computing the sha1sum of each file would NOT be efficient) The program discards files whose filename and mtime are in 'local' db. The program now computes the sha1sum of the (unencrypted contents of each remaining file. If the sha1sum matches one in 'local' db, we create a special entry in 'local' db that points this file/mtime to the file/mtime of the existing entry. Effectively, we're saying "we have a backup of this file's contents, but under another filename, so no need to back it up again". For each remaining file, we encrypt the file, take the sha1sum of the encrypted file's contents, rsync the file to its sha1sum. Example: if the file's encrypted sha1sum was da39a3ee5e6b4b0d3255bfef95601890afd80709, we'd rsync it to /some/path/da/39/a3/da39a3ee5e6b4b0d3255bfef95601890afd80709 on 'remote'. Once the step above succeeds, we add the file to the 'local' db. Note that we efficiently avoid computing sha1sums and encrypting unless absolutely necessary. Note: I don't specify encryption method: this would be user's choice. The problems: We must encrypt and backup 'local' db regularly. However, 'local' db grows quickly and rsync'ing encrypted files is inefficient, since a small change in 'local' db means a big change in the encrypted version of 'local' db. We create a file on 'remote' for each file on 'local', which is ugly and excessive. We query 'local' db frequently. Even w/ indexes, these queries are slow, since we're often making one query for each file. Would be nice to speed this up by batching queries or something. Probably other problems that I've now forgotten.

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• How do I (robustly) remotely execute tasks on Windows workstations in a domain?

  - by Zac B

  I'm not even sure if "robustly" is a word. Anyway. Context: We have a few hundred Windows 7 workstations on a LAN. We use AD/GPO management pretty heavily, but there are a lot of periodic and/or manual maintenance tasks we need to do that can't be done via GPO/scheduled task. For example, say I want to execute program X (which runs silently, in the background, and doesn't bother the user) on workstation Y, or say I want to execute task A on a workstation group B either on a schedule or on demand. Kicking the users off of their computers to do this (i.e. using RDP) is a no-no, and doesn't work on groups anyway. Question: What's the best way to do this that is robust enough that, after setup, I could give it to beginner support people (read: people who are phobic of the command line, and get confused with GUI interfaces more complicated than Firefox)? I'm a competent programmer, and, if there is a robust set of tools or framework out there for this type of task, I'd consider hacking something together myself if it didn't take too long. If there's some combination of tools or techniques that others use to make remote-workstation-administration doable by beginners, I have yet to find it. For those who care about the "why": I'm midlevel IT, and was told to implement a remote management solution that allows arbitrary/scheduled remote execution, with confirmation that programs actually ran remotely, and the ability to view what they returned. "Why?" I asked, "Can't I just use PsExec and the task scheduler on a dispatcher machine?" "No," I was told, "'Joe' the second-week tech is going to be in charge of this one, and he needs something simple with a GUI." What I've tried: I've played with making a bunch of one-clickable "transfer files to remote computer and run them with PsExec" batch/VB scrips, but those tend to break down and don't easily support running on customizable groups. I've played a little bit with the Windows version of Puppet, but it doesn't support arbitrary-time remote execution (it's ability to group computers into a tree/node structure is really nice though). I've used an older version of Altiris, and, while it does a lot of what I want, it's interface is awful, it's slow, crashes a lot, and is probably too expensive for management. SwiftWater's DMS solution does some of what I want, but it's very underdeveloped, closed-source (not a deal breaker but not ideal), and I get the impression that support and reliability are lacking.

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• How do I tell mdadm to start using a missing disk in my RAID5 array again?

  - by Jon Cage

  I have a 3-disk RAID array running in my Ubuntu server. This has been running flawlessly for over a year but I was recently forced to strip, move and rebuild the machine. When I had it all back together and ran up Ubuntu, I had some problems with disks not being detected. A couple of reboots later and I'd solved that issue. The problem now is that the 3-disk array is showing up as degraded every time I boot up. For some reason it seems that Ubuntu has made a new array and added the missing disk to it. I've tried stopping the new 1-disk array and adding the missing disk, but I'm struggling. On startup I get this: root@uberserver:~# cat /proc/mdstat Personalities : [linear] [multipath] [raid0] [raid1] [raid6] [raid5] [raid4] [raid10] md_d1 : inactive sdf1[2](S) 1953511936 blocks md0 : active raid5 sdg1[2] sdc1[3] sdb1[1] sdh1[0] 2930279808 blocks level 5, 64k chunk, algorithm 2 [4/4] [UUUU] I have two RAID arrays and the one that normally pops up as md1 isn't appearing. I read somewhere that calling mdadm --assemble --scan would re-assemble the missing array so I've tried first stopping the existing array that ubuntu started: root@uberserver:~# mdadm --stop /dev/md_d1 mdadm: stopped /dev/md_d1 ...and then tried to tell ubuntu to pick the disks up again: root@uberserver:~# mdadm --assemble --scan mdadm: /dev/md/1 has been started with 2 drives (out of 3). So that's started md1 again but it's not picking up the disk from md_d1: root@uberserver:~# cat /proc/mdstat Personalities : [linear] [multipath] [raid0] [raid1] [raid6] [raid5] [raid4] [raid10] md1 : active raid5 sde1[1] sdf1[2] 3907023872 blocks level 5, 64k chunk, algorithm 2 [3/2] [_UU] md_d1 : inactive sdd1[0](S) 1953511936 blocks md0 : active raid5 sdg1[2] sdc1[3] sdb1[1] sdh1[0] 2930279808 blocks level 5, 64k chunk, algorithm 2 [4/4] [UUUU] What's going wrong here? Why is Ubuntu trying to pick up sdd into a different array? How do I get that missing disk back home again? [Edit] - After adding the md1 to mdadm.conf it now tries to mount the array on startup but it's still missing the disk. If I tell it to try and assemble automatically I get the impression it know it needs sdd but can't use it: root@uberserver:~# mdadm --assemble --scan /dev/md1: File exists mdadm: /dev/md/1 already active, cannot restart it! mdadm: /dev/md/1 needed for /dev/sdd1... What am I missing?

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• $PATH is driving me nuts

  - by Chris4d

  OK, apologies if this is something dumb, but I'm running out of ideas. Goal: prepend /usr/local/bin to $PATH Problem: $PATH won't do what I want or expect How I got here: I want to start learning to program, so I'm getting comfortable messing around under the hood, but don't have a lot of experience. I installed the fish shell (because it's friendly!) using homebrew and set it as my default shell (under system prefs>users & groups>advanced). At some point, I ran brew doctor to see if my installs were all kosher, and it suggested I move /usr/local/bin to the front of $PATH so that I could use my installation of git rather than the system copy. Fine - but between path_helper and fish, something was happening to $PATH that was out of my control, and I could never get the paths arranged in the right way. Environment: OSX 10.8.2, upgraded from 10.7ish, with xcode and devtools installed, plus x11, homebrew, and fish More info: I've set my user's default shell back to bash, and tried a variety of shells thru terminal.app - bash, fish, sh. I moved /usr/local/bin to the top of /etc/paths but it didn't change anything. I looked thru the various config.fish files and commented out stuff that might mess with $PATH, didn't help. I have the following files in /etc/paths.d/: ./10-homebrew containing /usr/local/bin ./20-fish containing /usr/local/Cellar/fish/1.23.1/bin ./40-XQuartz containing /opt/X11/bin I added set +x to my profile and when I start terminal.app I get: Last login: Mon Oct 1 13:31:06 on ttys000 + '[' -x /usr/libexec/path_helper ']' + eval '/usr/libexec/path_helper -s' ++ /usr/libexec/path_helper -s PATH="/usr/local/bin:/usr/bin:/bin:/usr/sbin:/sbin:/usr/local/Cellar/fish/1.23.1/bin:/opt/X11/bin"; export PATH; + '[' /bin/bash '!=' no ']' + '[' -r /etc/bashrc ']' + . /etc/bashrc ++ '[' -z '\s-\v\$ ' ']' ++ PS1='\h:\W \u\$ ' ++ shopt -s checkwinsize ++ '[' Apple_Terminal == Apple_Terminal ']' ++ '[' -z '' ']' ++ PROMPT_COMMAND='update_terminal_cwd; ' ++ update_terminal_cwd ++ local 'SEARCH= ' ++ local REPLACE=%20 ++ local PWD_URL=file://Chriss-iMac.local/Users/c4 ++ printf '\e]7;%s\a' file://Chriss-iMac.local/Users/c4 Chriss-iMac:~ c4$ So it looks like path_helper runs, but then running echo $PATH nets me /usr/bin:/bin:/usr/sbin:/sbin. So, it looks like path_helper isn't even doing what it's supposed to anymore? I'm sure there is some well-defined behavior here that I don't understand, or I borked something while trying to fix it. Please help!

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• Set up Gmail with Google apps for own domain

  - by erdomester

  I rent a server from a German company. I have remote access to it as well as WHM and CPanel. I decided to use Google's mail servers for obvious reasons. I am not an admin just an average guy trying to set up what needs to be set up. The problem is I am unable to make the necessary settings. I watched Youtube tutorials, followed written ones as well as Google's help, but there is (at least) one serious problem with my domain settings. The domain console alwasy says Your MX records are incorrect When I check dappwall.com in mxtoolbox.com it says Pref Hostname IP Address TTL 10 mail.dappwall.com 46.4.88.247 24 hrs But this is not the host name. I checked WHM and my hostname is server1.dappwall.com. I can confirm it by typing the hostname command in putty. However, if I do an mx lookup at mxtoolbox.com on server1.dappwall.com or mail.dappwall.com I get Lookup failed after 1 name servers timed out or responded non-authoritatively I ran checks on the google apps toolbox on dappwall.com and two problems emerged: 1.No Google mail exchangers found. Relayhost configuration? 10 mail.dappwall.com In Google Apps > Settings for Gmail > Advanced settings it also says that my current MX records for dappwall.com is Priority Points to 10 MAIL.DAPPWALL.COM. So mail.dappwall.com again. I also have access to a robot provided by the company I rent the server from. Here I see this mail at two places but how should I (if it's necessary) modify this? I set Email routing to Automatically Detect Configuration. 2.There SHOULD be a valid SPF record. "v=spf1 include:_spf.google.com ~all" In the DNS Zone Editor I added this spf record: Name TTL Class Type Record dappwall.com. 1440 IN TXT v=spf1 include:_spf.google.com ~all In the cPanel Email Authentication page it says SPF: Status: Enabled Warning: cPanel is unable to verify that this server is an authoritative nameserver for dappwall.com. [?] Your current raw SPF record is : v=spf1 include:_spf.google.com ~all How can I confirm that my server is an authoritative nameserver for dappwall.com? In WHM Service Configuration Mailserver selection Dovecot was set but I disabled it (i don't know if that's ok). What am I missing here? Where is that mail.dappwall.com coming from?

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• Windows Server 2003 Standard R2 CD 1 cannot boot: freeze at No Emulation

  - by TGP1994

  Hi everyone. I've been interested in the Windows Server line of OSes, so since I apply for DreamSpark, I thought I'd go download it and try it. I just so happened to have an old desktop that I was using awhile ago for Windows XP, so I imaged the drive in preparation for it to be overwritten with the new OS. (This system has an Asus A7V8X-X motherboard, an AMD Athlon XP 2800+ processor, and 1GB of RAM.) I tried burning the first disk image on my newer desktop computer, running Windows XP, although the CD burner consistently failed at a particular track area from cd to cd, so it seemed like the burner was toast there. Fortunately, I had a laptop, so I transferred the images over to that, then burned the first disc there. First time around went great, and the burning program reported no errors. I then took the CD over to the computer that I was intending to install Server onto, set the BIOS to boot from the CD drive, then I booted it up. Like normal, after the POST, it printed "Boot from ATAPI CD-Rom: No Emulation", which I was used to seeing with bootable cds. I waited for the "Press any key to continue..." message that I had become so familiar with in windows discs, although I saw none. The computer sat there for about 5 seconds with the cd spinning, then it spun down like it was done reading it. Nothing else happened. No response from the keyboard. I tried again, same result. I then downloaded IMGBurn, and I put the burned cd into the laptop that burned it originally. I also downloaded a fresh image from the dreamspark site. I ran a verify session, and everything checked out. I later tried getting various DOS startup discs, then I tried booting the winnt binary, which supposedly initiates the installation process. Either the shells reported that not enough memory was available (since they would be running in low memory mode), or FreeDOS in particular would report Illegal instructions right away. Is the image corrupt at dreamspark, or am I doing something wrong?

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• Unknown problem causing major computer failure, Booting problem with windows 7, mainly with 0x0000000A

  - by ken

  Where do I begin? OS=Windows 7 I think it all started when I ran an installation file. I suspect it may have been a virus (even though AVG scan didnt pick anything up). The installation failed, computer crashed then restarted. In the middle of the reboot, I get BSOD. Normal boot up doesnt work so I use safe mode. Method 1: Not a problem I thought cos I will do what I normally do and that was to recover from my image file. Unfortunately, my Acronis software cant recover in safe mode. Method 2: I created a bootable disc for the Acronis recovery software. Managed to boot to Acronis and started the recovery from image file. This fail with some error message (did not manage to record). Something to do with not be able to copy to $AVG folder. Method 3: At this stage, assumed it was still a virus causing the problem so decided to format that partition to remove everything and hopefully the virus too. Had a lot of problems trying to bypass the system to allow me to format but (i think- more on this later) I managed to do that. Image was recovered, thought problem was resolved. Tried to boot windows but new error: Boot Manager is missing. Read up on this and managed to copy the Boot Manager from my Laptop's Manufacturer's partition (partition contains factory setup image file). Windows loaded but new BSOD with 0x000000A problem. Method 4: Attempted to reinstall factory settings but this failed cos i suspect by formating the partition, I may have removed the recovery software. Tried to create a bootable dvd of factory setting but machine is so bad it continues to crash. Bootable dvd method failed. Method 5:Spent alot of time reading up on this error, even installed a software to help scan and fix the problem. Scan failed and software required money! Anyway, lots of BSOD with different error message like 0x00000001A and 0x0000000D1. Error message changes with some reboots. Method 6: Found a hotfix from the windows site to fix 0x0000000A problem, great I thought! In safe mode, I cant install the file cos of error:0x8007043c. Tried to then install the fix in normal mode but installation just hangs. Returned to safe mode and followed advice to bypass 0x8007043c by changing the BITS status (read here: http://www.vistaheads.com/forums/microsoft-public-windowsupdate/181931-error-number-0x8007043c-windows-update.html). However, my machine at this time is so flaky that it hangs everytime i right mouse click the computer icon. I am at my wits end. Ya help or ideas? Cheers

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• Complete machine freezes...at a loss

  - by user28818

  Guys, We built around 12 machines a few months ago to run Ubuntu. They each have the following specs: ASUS Z8NA-D6 motherboard Dual quad core Intel(R) Xeon(R) CPU E5520 @ 2.27GHz OCZ Mod Extreme Pro 500W power supply 12 GB Kingston RAM Nvidia GeForce 9800 GT graphics card My machine ran well for awhile. However, it started experiencing random lockups. These lockups are not X lockups, they are complete system freezes. The nic stops responding, the magic sysrq buttons won't work. The machine is dead. I first suspected RAM. Memtest86 didn't find anything, but I replaced the RAM anyway. Still, lockups. So I replaced the graphics card. Still, more lockups. They became more and more frequent and started to happen 2-3 times a day. So I replaced the motherboard and power supply in one fell swoop. Suddenly, no more lockups! Woohoo! Except, a week later, in the morning, the machine wouldn't wake up. I reset it, started it up, and the log files showed the last entry at around 11 pm the evening before. This has started occurring with more frequency...now just about every morning I come in, the machine is locked up, and has been since the night before. Yesterday, in the 3 weeks since I replaced the motherboard and power supply, the machine actually locked up on in in mid-work. This is the first time since replacing the two (MB and PS) that this happened while I was using it. All others occurred while I was away. I'm at a loss. Nothing is in syslog or message that would indicate a problem around the time of the lockup. Temps are good...I use lmsensors to monitor and have a script that writes the output to file every minute. They never get that high. The only thing I haven't replaced at this point is the case and the harddrives. I doubt either could be the cause. What would you do if you were in my shoes? Is there a troubleshooting approach I'm missing? For the record, all of the other machines, all eleven of them, don't have any problems. They're all running the same version of Ubuntu (Lucid) that I am. Thanks!

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• Echo 404 directly from nginx to improve performance

  - by user64204

  I am in charge of production servers serving static content for a website. Those servers are constantly being crawled by bots looking for potential exploits (which isn't that much of a problem security-wise because no application can be reached behind the web server) but generates thousands of 404 per day, sometimes per hour. I am looking into ways of blocking those requests but it's tricky (you want to make sure you don't block legitimate traffic and these bots are becoming more and more clever at looking like they're legit) and is going to take me a while to find an acceptable solution. In the meantime I would like to reduce the performance impact of serving those 404 pages. Indeed we're using nginx which by default is configured to serve it's 404 page from the disk (This can be changed using the error_page directive but in the end the 404 will either have to be served from disk or from another external source (e.g. upstream application which would be worst)) which isn't ideal. I ran a test with ab on my local machine with a basic configuration: in one case I echo a message directly from nginx so the disk isn't touched at all, in the other case I hit a missing page and nginx serves its 404 from disk. server { # [...] the default nginx stuff location / { } location /this_page_exists { echo "this page was found"; } } Here are the test results (my laptop has Intel(R) Core(TM) i7-2670QM + SSD in case you're wondering why they are so high): $ ab -n 500000 -c 1000 http://localhost/this_page_exists Requests per second: 25609.16 [#/sec] (mean) $ ab -n 500000 -c 1000 http://localhost/this_page_doesnt_exists Requests per second: 22905.72 [#/sec] (mean) As you can see, returning a value with echo is 11% ((25609-22905)÷22905×100) faster than serving the 404 page from disk. Accordingly I would like to echo a simple 404 Page not Found string from nginx. I tried many things so far but they all failed, essentially the idea was this: location / { try_files $uri @not_found; } location @not_found { echo "404 - Page not found"; } The problem is that as soon as the echo directive is used, the http response code is set to 200. I tried changing that by doing error_page 200 = 400 but that breaks the configuration. How can I serve a 404 page directly from nginx? (without hacking the source which may be might next step)

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• Software Raid 10 corrupted superblock after dual disk failure, how do I recover it?

  - by Shoshomiga

  I have a software raid 10 with 6 x 2tb hard drives (raid 1 for /boot), ubuntu 10.04 is the os. I had a raid controller failure that put 2 drives out of sync, crashed the system and initially the os didnt boot up and went into initramfs instead, saying that drives were busy but I eventually managed to bring the raid up by stopping and assembling the drives. The os booted up and said that there were filesystem errors, I chose to ignore because it would remount the fs in read-only mode if there was a problem. Everything seemed to be working fine and the 2 drives started to rebuild, I was sure that it was a sata controller failure because I had dma errors in my log files. The os crashed soon after that with ext errors. Now its not bringing up the raid, it says that there is no superblock on /dev/sda2, even if I assemble manually with all the device names. I also did a memtest and changed the motherboard in addition to everything else. EDIT: This is my partition layout Disk /dev/sdb: 2000.4 GB, 2000398934016 bytes 255 heads, 63 sectors/track, 243201 cylinders, total 3907029168 sectors Units = sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 4096 bytes I/O size (minimum/optimal): 4096 bytes / 4096 bytes Disk identifier: 0x0009c34a Device Boot Start End Blocks Id System /dev/sdb1 * 2048 511999 254976 83 Linux /dev/sdb2 512000 3904980991 1952234496 83 Linux /dev/sdb3 3904980992 3907028991 1024000 82 Linux swap / Solaris All 6 disks have the same layout, partition #1 is for raid 1 /boot, partition #2 is for raid 10 far plan, partition #3 is swap, but sda did not have swap enabled EDIT2: This is the output of mdadm --detail /dev/md1 Layout : near=1, far=2 Chunk Size : 64k UUID : a0feff55:2018f8ff:e368bf24:bd0fce41 Events : 0.3112126 Number Major Minor RaidDevice State 0 8 34 0 spare rebuilding /dev/sdc2 1 0 0 1 removed 2 8 18 2 active sync /dev/sdb2 3 8 50 3 active sync /dev/sdd2 4 0 0 4 removed 5 8 82 5 active sync /dev/sdf2 6 8 66 - spare /dev/sde2 EDIT3: I ran ddrescue and it has copied everything from sda except a single 4096 byte sector that I suspect is the raid superblock EDIT4: Here is some more info too long to fit here lshw: http://pastebin.com/2eKrh7nF mdadm --detail /dev/sd[abcdef]1 (raid1): http://pastebin.com/cgMQWerS mdadm --detail /dev/sd[abcdef]2 (raid10): http://pastebin.com/V5dtcGPF dumpe2fs of /dev/sda2 (from the ddrescue cloned drive): http://pastebin.com/sp0GYcJG I tried to recreate md1 based on this info with the command mdadm --create /dev/md1 -v --assume-clean --level=10 --raid-devices=6 --chunk=64K --layout=f2 /dev/sda2 missing /dev/sdc2 /dev/sdd2 missing /dev/sdf2 But I can't mount it, I also tried to recreate it based on my initial mdadm --detail /dev/md1 but it still doesn't mount It also warns me that /dev/sda2 is an ext2fs file system but I guess its because of ddrescue

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• How to remove RAID flag on unstriped drive without losing data?

  - by Alex Folland

  I have a Gigabyte Z68X-UD4-B3 motherboard. It advertises this new thing called "XHD", which is like RAID but makes a SSD and traditional-style drive work together to enable high speed with high capacity. I don't want to use this feature, and I already have Windows 7 64 installed without using this feature. When I first installed my 2 hard drives (1 SSD and 1 traditional-style drive) in my machine and booted it up for the first time, it ran a program from the mobo that asked me if I wanted to set up XHD. Thinking it would go to some config screen, I said yes. It immediately started doing something with my drives and finished. I considered that strange, but figured it wouldn't matter when I simply install Windows onto my SSD only. I now have my BIOS and Windows running in AHCI mode with no RAID arrays and separate drives. My SSD is one of those new Corsair Force GT drives which loses power every so often, causing Windows to BSOD. I've figured everything out about this problem, including installing the latest firmware from Corsair, and the only way to fix it at this point is by installing Intel Rapid Storage Technology to control AHCI instead of Windows, since the Windows AHCI driver disables the drive's power every once in a while and can't be configured not to do so. I've tried installing Intel Rapid Storage Technology. When I reboot my machine after doing so, it BSODs just after the Windows logo. I've figured out this is because my SSD and my traditional drive are flagged as RAID, as seen in the "Intel Matrix Storage Manager" program found by switching the BIOS hard drive handling to "RAID" mode. This is due to the XHD auto-config program I mentioned earlier. Normally, the BIOS is set to AHCI, and when the drives boot in AHCI mode, they work perfectly. So, I've concluded the data is stored in AHCI mode but the drives' flags are set to RAID. I've figured out that I can accomplish my objective by using the "Intel Matrix Storage Manager" program on the mobo (with "Reset disks to non-RAID"), but doing so would cause it to completely wipe the drives I select. I want to simply toggle these flags from RAID to AHCI so Intel Rapid Storage Technology doesn't fail and cause a BSOD upon booting, but without wiping the drives.

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• My server's been hacked EMERGENCY

  - by Grant unwin

  I'm on my way into work at 9.30 p.m. on a Sunday because our server has been compromised somehow and was resulting in a DOS attack on our provider. The servers access to the Internet has been shut down which means over 5-600 of our clients sites are now down. Now this could be an FTP hack, or some weakness in code somewhere. I'm not sure till I get there. How can I track this down quickly? We're in for a whole lot of litigation if I don't get the server back up ASAP. Any help is appreciated. UPDATE Thanks to everyone for your help. Luckily I WASN'T the only person responsible for this server, just the nearest. We managed to resolve this problem, although it may not apply to many others in a different situation. I'll detail what we did. We unplugged the server from the net. It was performing (attempting to perform) a Denial Of Service attack on another server in Indonesia, and the guilty party was also based there. We firstly tried to identify where on the server this was coming from, considering we have over 500 sites on the server, we expected to be moonlighting for some time. However, with SSH access still, we ran a command to find all files edited or created in the time the attacks started. Luckily, the offending file was created over the winter holidays which meant that not many other files were created on the server at that time. We were then able to identify the offending file which was inside the uploaded images folder within a ZenCart website. After a short cigarette break we concluded that, due to the files location, it must have been uploaded via a file upload facility that was inadequetly secured. After some googling, we found that there was a security vulnerability that allowed files to be uploaded, within the ZenCart admin panel, for a picture for a record company. (The section that it never really even used), posting this form just uploaded any file, it did not check the extension of the file, and didn't even check to see if the user was logged in. This meant that any files could be uploaded, including a PHP file for the attack. We secured the vulnerability with ZenCart on the infected site, and removed the offending files. The job was done, and I was home for 2 a.m. The Moral - Always apply security patches for ZenCart, or any other CMS system for that matter. As when security updates are released, the whole world is made aware of the vulnerability. - Always do backups, and backup your backups. - Employ or arrange for someone that will be there in times like these. To prevent anyone from relying on a panicy post on Server Fault. Happy servering!

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• Server 2012 intermittently fails to respond to pings from single host, even with firewall disabled, but responds to non-ICMP requests fine

  - by James Westbury

  This one is kind of weird. I've got the following machines involved: DC01 - 10.1.2.42, Server 2012, domain controller & DNS server, physical machine nagiosv - 10.1.2.35, CentOS 6.4, Nagios, virtual machine CB01 - 10.1.3.81, Ubuntu 12.04 LTS, couchbase server, virtual machine So, I noticed something was wrong while configuring this new Nagios VM. I started seeing DC01's state flapping. I logged into nagiosv when I saw this happening, and attempted to ping DC01, both by FQDN and its IP address. Neither worked. I tried pinging the machine from CB01, which is another VM on the same virtual switch/physical NIC as nagiosv, and that worked fine. Pings still failing from nagiosv at this time. DC01 is also an internal DNS server, so I ran dig google.com from nagiosv, and was able to run a query against DC01 just fine: ;; Query time: 1 msec ;; SERVER: 10.1.2.42#53(10.1.2.42) ;; WHEN: Fri Nov 1 07:53:51 2013 ;; MSG SIZE rcvd: 204 Pings still failing from nagiosv, though. I can ping from DC01 to nagiosv, and that works, and I can still ping from other VMs on the same physical NIC into DC01, and that works. I should mention at this point that I've disabled the firewall on DC01 for testing purposes, and it doesn't make a damned bit of difference. (Even with the firewall enabled, I have a blanket exception for ICMP from the local subnet, so it shouldn't make a difference, but I figured I should test it anyway.) I loaded up Wireshark on DC01 and pinged it from nagiosv again. What I see is a bunch of echo requests coming in and not a single reply going back out. Filtered results here, showing all ICMP traffic during a 15-second period. A few more bits of info: There are no IP conflicts on the network. MAC addresses on the incoming pings match the MAC on the VM. There are no duplicate MACs on the network, as far as I can see. I have absolutely no idea why DC01 is failing to respond, here. Any ideas?

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• How to tune system settings for mongoDB on Linux?

  - by jsh

  Trying to squeeze a lot out of one question here -- please bear with me. Although the MongoDB man pages make several useful recommendations about system settings like ulimit (http://docs.mongodb.org/manual/reference/ulimit/), and other production factors (http://docs.mongodb.org/manual/administration/production-notes/) they seem mysteriously silent on things like virtual memory and swap settings. The closest we get to a hint is that "...the operating system’s virtual memory subsystem manages MongoDB’s memory..." (http://docs.mongodb.org/manual/faq/fundamentals/#does-mongodb-require-a-lot-of-ram). Running the same job - high writes and high reads on about 10,000,000 records in a single collection -- on my 4-processor, 4GB RAM macbook and an 8-core ubuntu box with 64GB RAM I saw dramatically WORSE read performance on the linux box with factory settings, and could hear the disk constantly spinning, indicating high I/O and presumably swapping. Yes, other things were happening on the box, but there was plenty of free RAM, disk space, etc.; furthermore, I did not see evidence that Mongo was expanding to take advantage of all that free RAM as it is touted to do. Linux box default settings were as follows: vm.swappiness =60 vm.dirty_background_ratio = 10 vm.dirty_ratio = 20 vm.dirty_expire_centisecs =3000 vm.dirty_writeback_centisecs=500 I hazarded some guesses looking at docs and blogs for other types of databases (Oracle, MYSQL, etc.), experimented, and adjusted as below. vm.swappiness=10 vm.dirty_background_ratio=5 vm.dirty_ratio=5 vm.dirty_writeback_centisecs=250 vm.dirty_expire_centisecs=500 I saw some immediate apparent improvements in read time. However, when I ran my test jobs again, read performance continued to be painfully sluggish during heavy writes. Then, I REBUILT the collection from an available data source - and suddenly I can read at 1ms or less per record WHILE doing the write job! So the question is really two-fold: 1) What are appropriate VM settings for MongoDB on Linux? 2) (bonus) Does Mongo do some checking or optimization with the OS while data is being built? In other words, if I have built a large data set with suboptimal VM or I/O settings, does Mongo make assumptions during the memory-mapping process that will fail to take advantage of optimizations down the road? Obviously I don't fully grok memory mapping under the hood (I was hoping I wouldn't have to). Any help appreciated...thanks! -j

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• Conflicting ip routes with local table on attaching a virtual network interface

  - by user1071840

  I have an EC2 instance with these ip rules: $ sudo ip rule show 0: from all lookup local 32766: from all lookup main 32767: from all lookup default I can attach an elastic network interface to it with a private IP. Say the IP of my machine is 10.1.3.12 and the IP of the interface is 10.1.1.190. As soon as I attach the interface to my machine a new entry is added to the routing policy and local routing table: sudo ip rule show 0: from all lookup local 32765: from 10.1.1.190 lookup 10003 32766: from all lookup main 32767: from all lookup default $ sudo ip route show table local broadcast 10.1.1.0 dev eth3 proto kernel scope link src 10.1.1.190 local 10.1.1.190 dev eth3 proto kernel scope host src 10.1.1.190 broadcast 10.1.1.255 dev eth3 proto kernel scope link src 10.1.1.190 broadcast 10.1.3.0 dev eth0 proto kernel scope link src 10.1.3.12 local 10.1.3.12 dev eth0 proto kernel scope host src 10.1.3.12 broadcast 10.1.3.255 dev eth0 proto kernel scope link src 10.1.3.12 broadcast 127.0.0.0 dev lo proto kernel scope link src 127.0.0.1 local 127.0.0.0/8 dev lo proto kernel scope host src 127.0.0.1 local 127.0.0.1 dev lo proto kernel scope host src 127.0.0.1 broadcast 127.255.255.255 dev lo proto kernel scope link src 127.0.0.1 I can send traffic to this ENI directly from a host that can have the same IP as the host the ENI is attached to. This is where the problem starts. I ran tcpdump on the port in question and saw multiple SYNs going to the ENI with src '10.1.3.12' and destination '10.1.1.190' but didn't see even a single ACK. In my understanding if ACKs were being sent from the ENI they'd have destination as 10.1.3.12 i.e. the same as the local machine's IP and such packets will now be routed as local packets matching local routing policy: local 10.1.3.12 dev eth0 proto kernel scope host src 10.1.3.12 I'd like to send all the packets originating from 10.1.1.190 (my ENI) to go back on the same interface i.e. eth3 in this case. Contents of the nee table 10003 are: $ sudo ip route show table 10003 default via 10.1.1.1 dev eth3 I think I can do the following: I don't know if its possible but probably decrease the priority of local table so the packets match the table 10003. Use iptables to mangle these packets and update the local table route to include the mark information But I'm not sure if these are the right approaches.

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• How to store data on a machine whose power gets cut at random

  - by Sevas

  I have a virtual machine (Debian) running on a physical machine host. The virtual machine acts as a buffer for data that it frequently receives over the local network (the period for this data is 0.5s, so a fairly high throughput). Any data received is stored on the virtual machine and repeatedly forwarded to an external server over UDP. Once the external server acknowledges (over UDP) that it has received a data packet, the original data is deleted from the virtual machine and not sent to the external server again. The internet connection that connects the VM and the external server is unreliable, meaning it could be down for days at a time. The physical machine that hosts the VM gets its power cut several times per day at random. There is no way to tell when this is about to happen and it is not possible to add a UPS, a battery, or a similar solution to the system. Originally, the data was stored on a file-based HSQLDB database on the virtual machine. However, the frequent power cuts eventually cause the database script file to become corrupted (not at the file system level, i.e. it is readable, but HSQLDB can't make sense of it), which leads to my question: How should data be stored in an environment where power cuts can and do happen frequently? One option I can think of is using flat files, saving each packet of data as a file on the file system. This way if a file is corrupted due to loss of power, it can be ignored and the rest of the data remains intact. This poses a few issues however, mainly related to the amount of data likely being stored on the virtual machine. At 0.5s between each piece of data, 1,728,000 files will be generated in 10 days. This at least means using a file system with an increased number of inodes to store this data (the current file system setup ran out of inodes at ~250,000 messages and 30% disk space used). Also, it is hard (not impossible) to manage. Are there any other options? Are there database engines that run on Debian that would not get corrupted by power cuts? Also, what file system should be used for this? ext3 is what is used at the moment. The software that runs on the virtual machine is written using Java 6, so hopefully the solution would not be incompatible.

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• BlueScreens on my ThinkPad with Windows 7 64 Bit and a SSD (CRITICAL_OBJECT_TERMINATION, ntoskernel.exe)

  - by pvorb

  I'm getting BlueScreens about every five days for more than three months. Here's an example: A problem has been detected and Windows has been shut down to prevent damage to your computer. The problem seems to be caused by the following file: ntoskrnl.exe CRITICAL_OBJECT_TERMINATION If this is the first time you've seen this stop error screen, restart your computer. If this screen appears again, follow these steps: Check to make sure any new hardware or software is properly installed. If this is a new installation, ask your hardware or software manufacturer for any Windows updates you might need. If problems continue, disable or remove any newly installed hardware or software. Disable BIOS memory options such as caching or shadowing. If you need to use safe mode to remove or disable components, restart your computer, press F8 to select Advanced Startup Options, and then select Safe Mode. Technical Information: *** STOP: 0x000000f4 (0x0000000000000003, 0xfffffa80065f2b30, 0xfffffa80065f2e10, 0xfffff80002f9bf40) *** ntoskrnl.exe - Address 0xfffff80002c98d00 base at 0xfffff80002c19000 DateStamp 0x4d9fdd5b It's has always been the same BlueScreen message showing CRITICAL_OBJECT_TERMINATION, 0x000000f4, and ntoskrnl.exe. Of course the addresses change. My computer is a ThinkPad T400 (about 2 years old) with a SSD in it. I'm also running Windows 7 Professional 64 bit. When I bought my computer, it had a 250GByte SeaGate HDD in it, which I replaced by a 500GByte HDD by Western Digital. Last september I bought a Corsair F120 SSD and replaced the HDD by this SSD. Then I bought a LEICKE HDD adapter for the UltraBay II where I plugged in my 500GByte HDD. This configuration ran about half a year without any errors. After re-installing Windows this spring, I am getting regular BlueScreens. Sometimes my system runs for about 2 weeks without a BSOD, sometimes I get several BlueScreens a day. The only thing that I noticed is, that I'm always running Google Chrome when it happens. Is there anyone who has made his/her own bad experiences whith some of my components or is there anybody who can tell me if it would be helpful to send my notebook to Lenovo? Thank you very much for your help on my issue! Regards, Paul

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• Router behind Router--second router (and its clients) cannot be "seen" even after both routers are D

  - by Trioke

  Couple of terminology I guess I should get out of the way for consistency's sake throughout the post: External Router/Modem - SMC 8014WG - External IP 173.32.144.134 - Internal IP 192.168.0.1 Internal Router - LinkSys WRT120N - "External" IP of 192.168.0.175 - Internal IP 192.168.1.1 - Connected via Ethernet Cable (a really long one, from the basement to the second floor) PC - IP 192.168.200 - Connected Wirelessly via WAP2 Personal. Laptop - Used to try and diagnose the problem, a 4th machine to the setup which won't be part of the final setup once everything works. The actual problem: I've tried setting the LinkySys router as a DMZ'd client on the SMC router, and then DMZ'd the actual PC on the LinkSys. So the DMZ looks like this: On the SMZ, client with IP 192.168.0.175 is DMZ'd. On the LinkSys, client with IP 192.168.1.200 is DMZ'd. No dice. I then tried port forwarding the necessary port on the SMC to the LinkSys (lets just say, port 80). Then port forwarded Port 80 on the LinkSys to the PC. Same as the DMZ scenario above, but change DMZ with port forwarding. No dice, still :(. Now here's where I went stupid--and tell me if one should never do this--I enabled both DMZ and port forwarding at the same time. I fired up Opera--my browser of choice ;)--typed in 173.32.144.134:6333 and... ... Third time is the charm they say? Well, clearly not. Otherwise I wouldn't be here ;). To diagnose the problem, I enabled "Allow remote access to the Admin panel" on the LinkSys router, and specified port 6333 as the port to use. I port forwarded port 6333 on the SMC to 192.168.0.175, and access my external IP of 173.32.144.134:6333 in hopes of seeing the Admin panel... No dice (I think I've ran out of dice by now ;)). So to see where the problem was, I connected a laptop to the SMC via LAN cable, and typed in 192.168.0.175:6333, and viola, Admin Panel access! So the problem looks like it lies with the SMC--But that's as far as I've got, I've done the port forwarding, the DMZ'ing, and I've even disabled the built-in firewall for safe measures, but nothing worked. So, here I am. Unable to connect to the PC behind the Internal router externally, and without anything to go on other than to come here and ask for the wisdom of the the superuser folks :). If any more detail is required, just ask. (Apologies in advance, if questions should never be this long winded!)

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• Need help troubleshooting highly variable ping times

  - by Elliot.Bradshaw

  I'm at work using Citrix (think Remote Desktop) to connect to client sites. With my job I have to write a fair bit of code while I'm connected remotely via Citrix, so the latency of my internet connection is important. If I'm getting ping times above 250ms, then it becomes almost impossible to scroll, click or type with accuracy. Recently my Comcast business internet has been exhibiting highly variable ping times. If I ping google.com, I'll get pings that range from 9ms all the way up to 1300ms. The problem seems to be at its worst during the hours of 1PM to 4:30PM. Outside of those hours and the variance in pings settles down, mostly between 9ms and 50ms. The signal to noise ratio and upstream power are both fine on my modem--the values are here: http://pastebin.com/D4hWGPXf I ran a trace route from my computer to google.com (the results of which are here: http://pastebin.com/GcdjYvMh) and did another test ping to the IP of the first hop outside of our local network (73.98.44.1)--the variance in ping times existed in exactly the same manner as if I were pinging Google. Connecting directly to the cable modem by CAT5 makes no difference. Here is a screenshot demonstrating the variance of the ping times: http://postimage.org/image/haocdeauv/full/ -- as you can see it can get pretty bad. Three Comcast techs have been out (two of them were here when the problem wasn't happening) and they as well as the regional tier 2 Comcast support were unable to diagnose the problem. I now have a ticket open with tier 3 support, but have yet to hear back from them. Does anyone know what could cause these sorts of problems or have any idea from the traceroute above where it could be originating? The regional tier 2 guy tried to tell me that what I'm seeing is normal--are highly variable ping times like that ever acceptable? Anything I should ask Comcast to do or look at to get this problem fixed? Any tips/advice much appreciated! Edit: This is Comcast cable internet at a small start-up, we've ruled out congestion in our private LAN as a cause (i.e., no one's watching YouTube when the pings become variable). Update: Tier 3 Comcast support advised swapping out the modem, a tech came here today and did that--same problem persists.

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• Remote Debian System Preventing Logon

  - by choobablue

  I have a dozen or so single board computers on a network running Debian (squeeze) and access them via ssh (ssh server is dropbear). To give an idea of the hardware of these computers they're 1.2 GHz x86 processors, 1GB of RAM and 4GB flash drives formatted as ext2 (I avoided ext3 to prevent the added flash write stress from journaling), there is also a swap partition on the drive. Normally the setup I'm using works great and I can access all the computers. Every once in a while one will prevent access. What happens is I try to connect via ssh (putty) and it gives me the login prompt, I enter the username and password and it responds 'Access Denied' and it will also refuse any public key in ~/.ssh/authorized_keys. The credentials are correct as they worked previously. The computer responds to pings and putty recognizes the server public key, which implies to me the system is still running. Restarting the server fixes the problem and I can log in again. (I tried a temporary fix of putting shutdown -r now in the root crontab but this doesn't seem to reliably be run once the hang happens) Once I restart however there doesn't seem to be any information in any of the system logs to indicate what happened, the logs are simply empty for that time period, as if the system had crashed. There is some custom software running on the system which appears to stop working (which is why I wanted to ssh to begin with). I'm assuming that this program is the source of the problems but I'm unsure of how it would cause it and how to debug what is happening. The most likely explanation I can think of is that there is a memory leak in the other program that then prevents dropbear from spawning a new login shell (and crontab from executing shutdown) as there is not enough free memory. But looking at memory usage of the other (working) computers there doesn't seem to be any meaningful increase in memory to indicate a leak (unless it's a very big, fast acting and rare leak). I would think that when the OS ran out of memory it would restart the system or kill processes (the Linux kernel restarts right?). The other thing I wonder about is if the fact that they are running off a flash drive could have some effect, especially the swap partition (which I think I should remove to prevent wear of the flash), but the flash drives are young (~1 month) and I don't think that wear would be a factor yet. Does anybody have an idea of what could cause these symptoms, if it could be done by a memory leak, or something else I haven't thought of. And does anybody know of a method to try to debug the problem and find out more information about what's going wrong?

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