I just installed Debian 6, after reboot sshd stopped responding. I put the default config file but it not help. In the logs (/var/log/auth,syslog) no errors. I think the problem is that sshd not start. How can I try to run it? maybe do something in the startup scripts? Unfortunately I do not have physical access to my virtual machine, and can only reload it and view/edit the files in the filesystem.
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Oh, thanks all. I found the problem.
/usr/sbin/sshd -e 2>/tmp/sshd_error to
/bin/sh: /usr/sbin/sshd: No such file or directory
Vaguely I could not understand where to lost a binary file on a freshly installed machine and I could work without it.
But now another question: how can I restore it?