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- James H. Newman
October 19, 2008, 9:38 pm
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I have a Linux box A running OpenSSH 4.2p1. Whenever I try to
open an SSH connection from A to some remote box B (running whatever SSH
software) the authentication phase completes all right. More to the
point, SSH packets are exchanged between both parties without any
problem, as long as everything happens in the authentication phase. For
instance, when using password authentication, and intentionally using the
wrong password, I can see in the server's traces all the dialog, in
particular how the server sends back (and the client receives, in the
client's traces) the corresponding authentication failure packets.
When the authentication phase is completed successfully A sends a
channel open packet, which elicits a channel open confirm packet from B.
The problem is that the dialog hangs indefinitely at that point, until B
just times out, waiting for A to send something. It seems to be an issue
with A, because it happens for all sorts of different servers B. Even
more, when A is the server and B is the client, the same behavior takes
Any suggestions where to look for the cause? I know this is not a
low-level networking issue per se (packets are exchanged without problems
up till that point) or something to do firewalls (it happens even without
Re: SSH connection hangs after authentication completes successfully
I have already done this. A to A works flawlessly. When setting
both the SSH client and server in debug mode I get to see the correct SSH
packet exchange to do the authentication. Like I said, it is immediately
after establishing the channel that the connection hangs.
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