[opensuse] ssh weirdness - ssh connects then hangs after transferring a few bytes
Hi, Has anyone else out there encountered problems with OpenSSH in opensuse 10.2? I'm having a weird problem connecting to certain servers: ssh connects absolutely fine, but attempting to run any commands once connected causes the session to hang. My investigations so far would seem to indicate that the session hang occurs when more than n bytes are transferred (not sure how many bytes, but a very small number) For example: ssh me@myserver.com -> connects ls /directory/with/very/few/files -> works ls /usr/bin -> causes session to hang (or anything that might require transfer of more than a few bytes) ... running `ls /directory/with/very/few/files` multiple times also causes the session to hang. Initially, I thought it might be something to do with an incompatibility between versions of OpenSSH on the client and host machines: suse 10.2 running OpenSSH 4.4p1 and the hosts on which I am experiencing problems all run OpenSSH 3.9p1 (RHEL4). However, the connection problems do not occur consistently with OpenSSH 3.9p1 as there are other servers running this to which I can connect without any strange behaviour. The elements which seem to lead to SSH hanging are: 1. OpenSSH 4.4p1 2. Combined with some (unknown) router or server configuration at the host's end Reverting to an older version of OpenSSH (or another distro) "fixes" the problem ... however, I would rather use opensuse and would rather not have to rip out the default ssh and ssl in order to do so. Has anyone experienced similar problems? Does anyone know what settings (either on client or host machine) might lead to this problem? Does anyone know a fix?! :D I've googled this subject to death over the last few days, but can't seem to find any answer ... it's beginning to get a bit desperate :( ... and the problem is difficult to debug because I can't get an SSH connection long enough to get any useful information from the host! Any comments/tips/suggestions etc very gratefully received. Cheers, Chris -- To unsubscribe, e-mail: opensuse+unsubscribe@opensuse.org For additional commands, e-mail: opensuse+help@opensuse.org
On Monday 22 January 2007 08:37, Christopher Townson wrote:
Hi,
Has anyone else out there encountered problems with OpenSSH in opensuse 10.2?
I'm having a weird problem connecting to certain servers: ssh connects absolutely fine, but attempting to run any commands once connected causes the session to hang. My investigations so far would seem to indicate that the session hang occurs when more than n bytes are transferred (not sure how many bytes, but a very small number)
For example:
ssh me@myserver.com -> connects ls /directory/with/very/few/files -> works ls /usr/bin -> causes session to hang (or anything that might require transfer of more than a few bytes)
Hi Chris Do you get any useful info by forcing verbose output from ssh? Doing 'ssh -vvv user@host.example.com' _might_ give some clues. Good luck Pete -- To unsubscribe, e-mail: opensuse+unsubscribe@opensuse.org For additional commands, e-mail: opensuse+help@opensuse.org
On 22/01/07 08:37 +0000, Christopher Townson wrote:
I'm having a weird problem connecting to certain servers: ssh connects absolutely fine, but attempting to run any commands once connected causes the session to hang. My investigations so far would seem to indicate that the session hang occurs when more than n bytes are transferred (not sure how many bytes, but a very small number)
Try running ssh in verbose mode, it may give you more useful information.
From the man page:
-v Verbose mode. Causes ssh to print debugging messages about its progress. This is helpful in debugging connection, authentication, and configuration problems. Multiple -v options increase the verbosity. The maximum is 3. hth, Craig -- To unsubscribe, e-mail: opensuse+unsubscribe@opensuse.org For additional commands, e-mail: opensuse+help@opensuse.org
On Jan 22 2007 08:37, Christopher Townson wrote:
Has anyone else out there encountered problems with OpenSSH in opensuse 10.2?
I'm having a weird problem connecting to certain servers: ssh connects absolutely fine, but attempting to run any commands once connected causes the session to hang. My investigations so far would seem to indicate that the session hang occurs when more than n bytes are transferred (not sure how many bytes, but a very small number)
Run tcpdump and watch out for spurious RSTs on the ssh connection. Found some? -`J' -- -- To unsubscribe, e-mail: opensuse+unsubscribe@opensuse.org For additional commands, e-mail: opensuse+help@opensuse.org
participants (4)
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Christopher Townson -
Craig Millar -
Jan Engelhardt -
Pete Connolly