[CentOS] SSH suddenly started failing :(

Paul Heinlein heinlein at madboa.com
Thu Jun 7 21:47:11 UTC 2007

On Thu, 7 Jun 2007, John Lagrue wrote:

> Paul Heinlein wrote:
>>  Try a different tack. Get a root shell on the machine in question
>>  and fire up sshd in no-fork mode under strace:
>>    strace -o /tmp/ssh.trace sshd -D -p 2222
>>  Then try to ssh into that machine on port 2222 (or whatever you
>>  choose). Assuming it fails, close down the temporary sshd and
>>  point $PAGER at /tmp/ssh.trace. The failure point will likely be
>>  about 90% of the way through the file. (The end of the file will
>>  be related to closing down sshd).
> I tried that, and monitored the ssh.trace file with tail-f in 
> another window. There were no obvious signs of error, only what 
> looks like a child starting and then exiting. Mind you, it's been a 
> fair few years since I last looked at a trace file!

Ugh. Sorry. Try -d instead of -D, so sshd won't fork... You can use up 
to three -d switches to increase verbosity.

Paul Heinlein <> heinlein at madboa.com <> http://www.madboa.com/

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