If you have ever been logged into an ssh session and had your connection burp and freeze your ssh session, here's a way to get it back without closing the session and opening a new one. Try the following key combination to bring back your locked up ssh session...
ENTER ~ .
(enter key,then shift ~, then period)
This should bring back your ssh session if connectivity comes back. Also, if you were using 'screen' during your ssh session, it would be like you never left and you would be exactly where you were before it locked up :)