Need Help Diagnosing Server Wierdness

[Mark Phillips]

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 <lisakachold at obnosis.com>wrote:

> Hello Mark,
>
>
>
>
> On Sat, May 25, 2013 at 11:59 AM, Mark Phillips <
> mark at phillipsmarketing.biz> wrote:
>
>> I have an old headless server running Linux version 2.6.32-5-686 (Debian
>> 2.6.32-48squeeze1) (dannf at debian.org) (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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