How to restart ssh?

When I try to ssh or rsync from one of my
linux units to another, most of the time it
works, but sometimes I get this error message:

ssh: connect to host 192.168.0.56 port 22: No route to host

I have tried 'sudo service ssh restart'
but that no longer works.

How can I get it restarted and keep it working?

Joe

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