If you get an error "Adress already in use" with autossh check with lsof or netstat if something already listen on the Ports you want to use.

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There are three Ports you have to look at. If your Command look like this:

/usr/local/bin/autossh -f -M 5100 -g -N -C -L 8080:127.0.0.1:80 example.com -i ~/.ssh/id_rsa -l user

The following three ports need to be available:

1. 8080: The Port you want the tunnel to listen
2. 5100: The Autossh Monitoring Port
3. 5101: Autossh also uses the Monitoring Port +1