[Bug 522819] [NEW] Loosing connections with "Connection reset by peer" message

[GregoryHuey]

Public bug reported:

lsb_release -rd
Description:	Ubuntu 9.10
Release:	9.10

ssh (openssh 1:5.1p1-6ubuntu2)

What should happen:
I log into a remote host from my Ubuntu machine via ssh. That login should remain - the connection should be maintained, and I should be able to return to it later and type commands into the shell, see their output, etc. That is, the login shell should remain viable over time.

What does happen:
After some time - minutes to hours - the connection is lost, with an error message like:

Read from remote host isildur: Connection reset by peer
Connection to isildur closed.

This is apparently at random. It does not happen to all the ssh logins
at once. But it does happen to all of them eventually - and the
connections are to many different machines, so I know its not a problem
specific to a single remote host that I am ssh-ing into. Two of the
remote machines I've seen this happen with are other machines I own and
control, and they are on a local network merely 3 feet from the Ubuntu
machine. Its clear that the problem lies with the Ubuntu machine. This
is a new problem also - note that it only started recently - after the
most recent update manager update of the Ubuntu box.

I know this might not be a ssh bug, but rather a bug in the underlying
networking infrastructure - but I don't know how to track it down. I've
looked at all the log files in /var/log, and see no error messages that
indicate why this is happening.

I may have not given you enough info to solve this problem, but I need
to be told how and where to collect further info - like where the
applicable log file can be found.

ProblemType: Bug
Architecture: amd64
Date: Tue Feb 16 11:36:19 2010
DistroRelease: Ubuntu 9.10
InstallationMedia: Ubuntu 9.10 "Karmic Koala" - Release amd64 (20091027)
NonfreeKernelModules: nvidia
Package: ssh (not installed)
ProcEnviron:
 PATH=(custom, no user)
 LANG=en_US.UTF-8
 SHELL=/bin/bash
ProcVersionSignature: Ubuntu 2.6.31-19.56-generic
SourcePackage: openssh
Uname: Linux 2.6.31-19-generic x86_64

** Affects: openssh (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug

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Loosing connections with "Connection reset by peer" message
https://bugs.launchpad.net/bugs/522819
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