Connect to Syncthing remotely

You can use SSH port forwarding to configure the GUI remotely. Assuming your remote Syncthing instance offers the GUI on port 8384, try something like this:

$ ssh -L 9384:127.0.0.1:8384 remote-server

Then, you can point your local web browser at 127.0.0.1:9384 and configure the remote machine.

I prefer SSH port forwarding for such cases, i.e. I connect from my computer to the server via SSH using a command like

ssh -L 9090:localhost:8384 myserver.com

What this command does is establish a SSH connection between my computer and myserver.com and makes sure that the server’s localhost:8384 (that is, the Syncthing web interface) is mirrored to my local computer’s port 9090. I can then open localhost:9090 in my browser, and it works the same as if I opened localhost:8384 on the server, as long as the SSH session is active.