Red Hat Bugzilla – Bug 128332
sshd periodically becomes unavailable without logging an error
Last modified: 2007-11-30 17:10:46 EST
From Bugzilla Helper: User-Agent: Opera/7.23 (X11; Linux i686; U) [en] Description of problem: On a 2GHz Opteron with builtin Intel 82541EI Gigabit card, and a vanilla Fedora Core 2 installation (kernel-2.6.6-1.435.2.3 and openssh-3.6.1p2-34), ssh connections periodically die. Every few minutes (time interval not reproducible) all ssh connections to the box die with following message (the box is named donder) Read from remote host donder: Connection reset by peer Connection to donder closed For a number of minutes after that, attempted ssh connections to the machine will give the error message blitzen 63% ssh donder ssh: connect to host donder port 22: Connection refused Nothing corresponding to either occurence appears in the either /var/log/secure or /var/log/messages on the server. However, after several minutes, the problem magically fixes itself again, again with no messages in the log. I don' t think this is a network card issue, because the box always responds to pings, and the machine remains usable at the console. Version-Release number of selected component (if applicable): openssh-3.6.1p2-34 kernel-2.6.6-1.435.2.3 How reproducible: Always Steps to Reproduce: 1. From another machines, ssh to the x86-64 machine 2. Wait. The connection will die. 3. Actual Results: Connection dies Expected Results: Connection shouldn't die. ;) Additional info:
I left out a possibly important piece of information: this is a dual cpu box, running the smp version of the kernel
Whenever I've seen this problem, it's been because another machine was present on the network with the same IP address. Just mentioning this in case you haven't checked for this possibility yet.
Barry Nathan's comment is correct -- the problem was in our local network configuration, and NOT in fedora.