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Doing this with crash SSH if you don't have the right version of OpenSSH installed. If you can't walk over to the server, then you will be locked out and need to have your host provider manually fix the issue at the server itself.

If you have *any doubts*, temporarily enable Telnet so that you can have a backdoor in to fix your sshd_config file if needed.

I followed advice which led people to believe that you can have an old version, say 3.9 on CentOS, that if your server does regular updates your version has been backported and all necessary patches have been applied. DO NOT RELY ON THIS! Manually install the update if your version is not up to date.