Red Hat Bugzilla – Bug 128332
sshd periodically becomes unavailable without logging an error
Last modified: 2007-11-30 17:10:46 EST
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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
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):
Steps to Reproduce:
1. From another machines, ssh to the x86-64 machine
2. Wait. The connection will die.
Actual Results: Connection dies
Expected Results: Connection shouldn't die. ;)
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.