openssh bugs - Jan 2006 - [Bug 1143] connections with "sshd: root@notty" is established but not closed

http://bugzilla.mindrot.org/show_bug.cgi?id=1143

           Summary: connections with "sshd: root at notty" is
established but
                    not closed
           Product: Portable OpenSSH
           Version: 3.9p1
          Platform: ix86
        OS/Version: Linux
            Status: NEW
          Severity: critical
          Priority: P2
         Component: Kerberos support
        AssignedTo: bitbucket at mindrot.org
        ReportedBy: knsujit at yahoo.com


There is connection leak between my twom production servers. One server shows
number of sshd processes in sleep mode with name "sshd:root at notty".
This server
has ssh version 3.9 installed.

Another server on other hand shows same number of ssh processes with name
"/usr/bin/ssh -x -oFallBackToRsh no -lroot 172.25.32.105 scp -t
/var/log/gtwlogs/gtw40.log". This server has ssh version 2.9pl installed.I
can
not upgrade this ssh version as of now as this is planned sometimes later.

Please help me knowing the exact cause behind this.

Regards
Sujit




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http://bugzilla.mindrot.org/show_bug.cgi?id=1143





------- Comment #1 from dtucker at zip.com.au  2006-01-11 21:50 -------
Sounds like the client is either stalling or completing and not closing the
connection afterward.  There ought to be corresponding TCP connections shown in
netstat, what's the SendQ on those on both client and server?

You can try enabling ClientAliveInterval in sshd_config on the server running
3.9.  You can try killing the ssh processes on the client, if that's the
only
thing that helps and you really can't upgrade ssh then you'll probably
have to
script the kill and put it in cron.




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