Two New Power User Hacks
~. – terminate connection (and any multiplexed sessions)
~B – send a BREAK to the remote system
~C – open a command line
~R – request rekey
~V/v – decrease/increase verbosity (LogLevel)
~^Z – suspend ssh
~# – list forwarded connections
~& – background ssh (when waiting for connections to terminate)
~? – this message
~~ – send the escape character by typing it twice
(Note that escapes are only recognized immediately after newline.)

Tip #2. The other a really handy technique to regain control of my system. The Kernel was hung something severe, turned out to be a problem with the network storage. I ran the magic key for Immediately reboot the system, without unmounting or syncing filesystems

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