Use SSH escape sequences and codes

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SSH supports escape sequences that let you control an active connection from your terminal. Each sequence starts with the escape character, which is ~ by default, followed by another character.

If an SSH connection becomes frozen, use ~. to terminate it and return to your local terminal:

~.

The escape sequence must be entered at the beginning of a new input line. You can use it even when the remote terminal appears stuck.

You can also keep an SSH connection open without occupying your current terminal window. Press ~, then Ctrl+Z:

~^Z

This suspends the SSH session and returns you to your local shell. When you want to reconnect to the suspended session, use fg and press Enter:

fg

The fg command brings the most recently suspended job back into the foreground, restoring your SSH session.