SSH WebGUI forwarding headless server

There are multiple errors involved here.

  1. As @calmh pointed out, apparently the service doesn’t even start because of a malformed address in config.xml.
  2. In your initial post, you said the browser refused to connect on port 9090, while your SSH command uses port 9092.
  3. If you run syncthing cli errors show on your local device, you need to pass --gui-address, in your case the forwarded local port localhost:9092, and --gui-apikey with the API key of the remote machine where syncthing runs.
  4. If you run the same command on the remote machine and it shows connection refused, then Syncthing is indeed most probably not running.
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