Keeping SSH connections alive

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It's actually fairly simple. In your SSH config file, you add this:

Host *    ServerAliveInterval 240

The * after the host can be whatever host you want it to apply to, and *simply means to apply this to all hosts. So you could also apply it this way:

Host example.com    ServerAliveInterval 240

Also, if you aren't sure where your SSH config file is, on a UNIX based system, it's generally in ~/.ssh/config.