Install autossh by entering the following commands in the terminal:
sudo apt update sudo apt install autossh
Description:
Automatically restart SSH sessions and tunnels
autossh is a program to start an instance of ssh and monitor it, restarting it as necessary should it die or stop passing traffic. The idea is from rstunnel (Reliable SSH Tunnel), but implemented in C. Connection monitoring is done using a loop of port forwardings. It backs off on the rate of connection attempts when experiencing rapid failures such as connection refused.
Homepage: http://www.harding.motd.ca/autossh/
Version: 1.4e-4
Section: universe/net