SSH escape sequence supported by OpenSSH_5.9p1 Debian-2, OpenSSL 1.0.0g 18 Jan 2012, stolen directly from ~?: [[!format txt """ ~. - terminate connection (and any multiplexed sessions) ~B - send a BREAK to the remote system ~C - open a command line ~R - Request rekey (SSH protocol 2 only) ~^Z - suspend ssh ~# - list forwarded connections ~& - background ssh (when waiting for connections to terminate) ~? - this message ~~ - send the escape character by typing it twice """]

Handy for terminating stuck SSH session and forwarding more ports without resorting to starting a new connection with the appropriate command-line parameters.