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Debian GNU/Linux Reference Guide
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9.5.6 Troubleshooting SSH

If you have problems, check the permissions of configuration files and run ssh with the "-v" option.

Use the "-P" option if you are root and have trouble with a firewall; this avoids the use of server ports 1–1023.

If ssh connections to a remote site suddenly stop working, it may be the result of tinkering by the sysadmin, most likely a change in host_key during system maintenance. After making sure this is the case and nobody is trying to fake the remote host by some clever hack, one can regain a connection by removing the host_key entry from $HOME/.ssh/known_hosts on the local machine.


Debian GNU/Linux Reference Guide
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