ssh CTRL + s recovery

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If you use CTRL + s (software flow control or XOFF/XON flow control) during a ssh session your terminal seems to stop responding to any keystroke.
However, the terminal is still connected, by typing CTRL + s you sent XOFF, meaning transmit off, which pauzes the transmission. CTRL + q, XON, resumes the transmission.
Keep in mind that everything you type after CTRL + s is buffered and will be sent when you resume the transmission with CTRL + q.

You can prevent CTRL + s not sending XOFF by editting your .bashrc and add:
stty ixany
stty ixoff -ixon

 

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