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How to Keep Your Linux SSH Session Alive

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 *
   ServerAliveInterval 60


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