SSH-connections hanging (IP-filter related?)

From: Rob De Langhe (rob.delanghe_at_telindus.be)
Date: 12/09/03

  • Next message: David Price: "Disksuite Problem" 
    To: "'sunmanagers@sunmanagers.org'" <sunmanagers@sunmanagers.org>
Date: Tue, 9 Dec 2003 19:14:54 +0100

    Hi,
     
    since a few weeks when I upgraded to OpenSSH v3.7.1p2 (on OpenSSL 0.9.7c),
    and it seems that since then I keep getting problems with SSH connections to
    distant servers which keep hanging :
     
    I batch a lot of commands from a central server, which does SSH-connections
    to remote servers to invoke commands on there. When that remote command
    completes, I expect that remote SSHD to close the connection, so that the
    client-SSH on the central server can terminate.
    But this doesn't happen : the remote commands complete entirely, and only
    the parent "sshd" program remains in the proc table without childs. The
    connection from the central server is still ESTABLISHED, and a "truss" on
    the SSHD program shows a "poll()" that's hanging.
    Sure on the connecting side (the central server), the "ssh" client is still
    waiting for the remote end to close the connection. And so my batch jobs
    hang...
     
    We run IP-Filter everywhere, and I noticed a few posts on the Internet that
    might indicate relationship of this SSH-problem with the fact that IP-filter
    is controlling the communications.
     
    The version of IPF is 3.4.30, with a lot of rules which I do not include
    (yet) since I donow if they are relevant (until someone confirms).
     
    Any hints/tips ?
     
    TIA
     
    Rob
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