How do I close a frozen SSH session?

Sometimes an SSH session to a remote server will freeze indefinitely due to bad internet connectivity. Is it possible to close the session without closing the terminal?

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Press the following three keys:

  1. Enter
  2. ~ (tilde)
  3. . (period)

This is the "disconnect" function as described in the ESCAPE CHARACTERS section of the ssh man page.

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In this post, geekosaur suggests we use the escape sequences as follows: "To kill the current session hit subsequently Enter ↵, ~, ..

More of these escape sequences can be listed with Enter ↵, ~, ?:

Supported escape sequences:
~.  - terminate session
~B  - send a BREAK to the remote system
~R  - Request rekey (SSH protocol 2 only)
~#  - list forwarded connections
~?  - this message
~~  - send the escape character by typing it twice
(Note that escapes are only recognized immediately after newline.)

You can close the list of Escape sequences by hitting Enter ↵.

Notice that because hitting ~~ causes ssh to send the ~ instead of intercepting it, you can address ~6 nested ssh connections by hitting ~ ~6 times. (This only applies to ~s that directly follow an Enter ↵.) That is to say that Enter ↵~~~~~~5 terminates an ssh session 5 layers deep and keeps the other 4 intact."


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