Re: Need Help Diagnosing Server Wierdness

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Author: Derek Trotter
Date:  
To: Main PLUG discussion list
Subject: Re: Need Help Diagnosing Server Wierdness
Buying your coffee at the grocery store and drinking it at home for a
week will probably save you enough to buy a new laptop for when you go
back to Starbucks.

On 05/26/2013 02:12 PM, Mike Bydalek wrote:
> Don't give up your Starbucks! Until you get it fixed (and as a good
> backup access mechanism) check out http://www.teamviewer.com. Every OS
> is supported and you can access your desktop from a web browser remotely.
>
> -Mike
>
> On Sunday, May 26, 2013, Mark Phillips wrote:
>
>     Thanks to everyone for their suggestions!

>
>     The good news.....the server is healthy, and I solved the problem
>     of the "ssh session ignoring me every few minutes". It seems I
>     made a mistake in the configuration of openVPN in my new ASUS
>     DD-WRT router.

>
>     The better news....turning off openVPN on my router also solved my
>     intermittent LAN printing and scanning issues.

>
>     The bad news.....need to fix the VPN connection to my LAN. I guess
>     I will be drinking my Starbs at home for awhile! ;)

>
>     Happy Memorial Day Weekend to all PLUGers!!

>
>     Mark

>
>
>     On Sun, May 26, 2013 at 1:44 AM, Lisa Kachold
>     <> wrote:

>
>         Hello Mark,

>
>
>
>
>         On Sat, May 25, 2013 at 11:59 AM, Mark Phillips
>         <> wrote:

>
>             I have an old headless server running Linux version
>             2.6.32-5-686 (Debian 2.6.32-48squeeze1) ()
>             (gcc version 4.3.5 (Debian 4.3.5-4) ). Recently, when I
>             log in using ssh the terminal window freezes for a few
>             seconds, then usually comes back. The command line stops
>             printing the characters I am typing, the cursor stops
>             blinking, and then after a few seconds, it comes back.
>             This happens every few minutes, so it is becoming rather
>             annoying.

>
>
>         Here's the general list (some of which you have done already).

>
>         0 - Make sure that it's not swapping with "free".
>         1 - Check that you have no ethernet errors with "ethtool eth0"
>         (or whatever your interfaces are) and look for errors.
>         1.5 - Check  ' netstat -s -p|grep "segments retransmited" '
>         for packet loss
>         2 - Check "netstat -antp" to see what is listening and/or
>         bogging down.
>         3 - Check "lsof" to see what the system is doing.
>         4 - Are you accessing SSH via SSH forwarding, a different
>         place/network or VPN?  This could be a MTU issue.
>         5 - Run "nmap $servername" from your system to check what is
>         available and listening.
>         6 - Look in your logs for security issues; specifically access
>         attempts to open ports; firewall to only allow source and
>         destination for SSH, DNS or other Mail as appropriate.
>         7 - Disable your SSH timeout - just to be safe:
>         http://docs.oseems.com/general/application/ssh/disable-timeout
>         8 - Use a ping from your system to the server to see if you
>         can see latency.
>         9 - Use a traceroute/tracert to see latency between any hop.

>
>         Use the Source my friend!

>
>
>             When I check the disks, I get
>             # df -h
>             Filesystem            Size  Used Avail Use% Mounted on
>             /dev/sda1             182G   42G  131G  25% /
>             tmpfs                 505M     0  505M   0% /lib/init/rw
>             udev                  500M  140K  500M   1% /dev
>             tmpfs                 505M     0  505M   0% /dev/shm
>             /dev/sdb1             230G  146G   72G  67% /mnt/sdb

>
>             So I am not running out of disk space.

>
>             When I run top, I get this output:
>             Tasks:  90 total,   3 running,  87 sleeping,   0
>             stopped,   0 zombie
>             Cpu(s):  7.0%us,  3.0%sy,  0.0%ni, 82.7%id, 6.6%wa, 
>             0.3%hi,  0.3%si,  0.0%st
>             Mem:   1032748k total,  1013748k used, 19000k free,  
>             242992k buffers
>             Swap:  2017272k total,     1040k used, 2016232k free,  
>             473584k cached

>
>             So I am not running a process that is taking over the CPU.

>
>             How should I go about diagnosing this problem?

>
>             Thanks!

>
>             Mark

>
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>
>
>
>
>         -- 

>
>         (503) 754-4452 Android

>
>
>
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"I get my copy of the daily paper, look at the obituaries page, and if I’m not there, I carry on as usual."

Patrick Moore

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