[Bug 578] SSH freezes on cluster machine

[bugzilla-daemon at mindrot.org]

http://bugzilla.mindrot.org/show_bug.cgi?id=578

           Summary: SSH freezes on cluster machine
           Product: Portable OpenSSH
           Version: -current
          Platform: ix86
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: P2
         Component: ssh
        AssignedTo: openssh-bugs at mindrot.org
        ReportedBy: andrews at comp.nus.edu.sg


I am user of a cluster where I test my distributed program which consists
of several computing "worker" programs running on different nodes. The
workers communicate with one another using tcp, port 9900. I execute
the workers remotely using ssh 

OpenSSH_3.4p1, SSH protocols 1.5/2.0, OpenSSL 0x0090602f

The administrator has recently downgraded ssh to 3.4p1 after 3.5p1
also exhibited the same problem.

The cluster is running Rocks v2.2, Linux kernel 2.4.18-27.7.xsmp

I noticed that some (not all) of the nodes start having problems after I ran
my program on them. When I try to ssh to those nodes, ssh freezes.
But after a while (usually 1/2-1 day), ssh to those affected nodes return the
message

ssh_exchange_identification: Connection closed by remote host

Thank you in advance for any help.


Andrew



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