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Ctrl c?
If Putty itself freezes then alt+f4
Is putty freezing or is something else in the SSH session freezing?
Ctrl-Q should free the queue
never had putty freeze!
Good, want an icecream now?
That'll make yo brain freeze
Yeah control q recovers from control s
Alt+F4
Reopen
screen -x
If putty freezes for no apparent reason while idle, it might be a stateful firewall TCP timeout. Then You must configure under Connection>Enable TCP Keepalives and Connection>Seconds Between Intervals put it to let's say 15 seconds, that should be quite low. Now You should save the settings as premanent and establish a new session.
If putty gets "stuck" because it waits stdout output from running program then Ctrl+C to kill the program, or Ctrl+Z to suspend that running process to background, then bg to unsuspend the process and leave it to background, or fg to unsuspend and bring it back to foreground.