To kill a frozen OpenSSH session, type “⏎ ~ .” – aka Enter, Tilde, Period

Type "⏎ ~ ?" for a tiny options menu!

Credit where credit is most definitely due: https://www.reddit.com/r/linux/comments/4hlsmn/til_how_to_pr...

As one of the commenters in that thread noted, "Open command line" in the aforementioned options menu lets you manipulate the port forwarding table in an open session; type 'h' for further help.

And as another commenter said, I guess I should have properly gone through the manpage for SSH at some point (along with many other manpages)...

I'm very interested to know where this feature does/does not work on the various variants of UNIX and BSD that are out there. I expect this is a standard OpenSSH feature, but when was it introduced, and how widely is it supported?

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Also, as a semi-rant aside: the usage of the Enter key is an incredibly, incredibly poor choice - what about the scenario where the connection has died badly enough that update packets are being dropped, but your keystrokes are getting through, and the remote system gets into a state where you would NOT want to send a carriage return?

I've had VNC freeze up on me once or twice where I reconnect and find that my typing input got through, but that the display updates just couldn't make it back. Granted, VNC is a bit heftier than SSH, but if in certain situations I don't think I'd feel too bad about chickening out and resorting to `kill` (or ^B X, as the author writes).

Also, I don't think I need to add "(2012)" to the end of this.