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I have a CentOS Linux server with a SSH connection. It works perfectly but from time to time, the server refuses the connection.

If I reboot the server, I can SSH again.

What could be wrong?

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What do you have in the logs? –  Mat Nov 25 '12 at 10:29
    
what log should I check? –  Digital Robot Nov 25 '12 at 10:35
    
/var/log/messages and the other stuff in there. –  Mat Nov 25 '12 at 10:54
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2 Answers

up vote 1 down vote accepted

Try running sshd on the server in debug mode (-d, you can go up to -ddd) to get additional info. You can do this even remotely if don't happen to have the server under your table: log in, and then you can start another sshd instance on a different port with the -p option and try to log on into this instance.

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Check to log on the server:

grep -Ri ssh /var/log/*

and also use SSH with more verbosity on the client:

ssh -vvv user@server
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