I’m the type of geek that has an SSH client open at all times, connected to my most frequently used servers so that I have instant access for monitoring and anything else. As such, it irritates me greatly when I get disconnected, so I’m sharing a few methods for keeping your session alive.

You can configure the ssh client to automatically send a protocol no-op code code every number of seconds so that the server won’t disconnect you. This is setting is sometimes referred to as Keep-Alive or Stop-Disconnecting-So-Much in other clients.

Global Configuration

Add the following line to the /etc/ssh/ssh_config file:

ServerAliveInterval 60

The number is the amount of seconds before the server with send the no-op code.

Current User Configuration

Add the following lines to the ~/.ssh/config file (create if it doesn’t exist)

Host *
  ServerAliveInterval 60

Make sure you indent the second line with a space.

Per-Host Configuration

If you only want to enable keep alive for a single server, you can add that into the ~/.ssh/config file with the following syntax:

Host *hostname.com
   ServerAliveInterval 60

Works quite well, hope it helps somebody else out there.