This will not allow any machine to connect on the port it's listening on.
The idea is that you set Endlessh on your server's port 22 (standard SSH port), then configure "actual" SSH to listen on a different (randomly selected) port. You connect to that port to get stuff done. Bots that troll for connections on port 22 will get stuck on port 22.
The idea is that you set Endlessh on your server's port 22 (standard SSH port), then configure "actual" SSH to listen on a different (randomly selected) port. You connect to that port to get stuff done. Bots that troll for connections on port 22 will get stuck on port 22.