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) (dannf@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 > > --------------------------------------------------- > PLUG-discuss mailing list - PLUG-discuss@lists.phxlinux.org > To subscribe, unsubscribe, or to change your mail settings: > http://lists.phxlinux.org/mailman/listinfo/plug-discuss > -- (503) 754-4452 Android (623) 239-3392 Skype (623) 688-3392 Google Voice ** it-clowns.com Chief Clown