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How to open a Garry's Mod server to friends without a public IP

Since app version 1.3.0

Create a Garry's Mod server in ProximaClient with a public tunnel and send your friends its address: they join with the connect command in the game console. The app downloads the server files by itself.

Steps​

  1. Create the server as described on "Create a game server": pick Garry's Mod and tick "Create a public tunnel for this server" at the "Setup" step.
  2. On the "Launch options" tab, pick the "Game mode" (Sandbox to start with) and, if you need one, enter a Steam collection number in "Workshop collection": on start the server downloads the collection and loads all of it.
  3. Click "Start". On the first start a "Steam token for the server" window opens: create a token on Steam's token page following the steps in the window and click "Save and start", or click "Start without a token". Without a token the server works, but Valve ranks it lower in the server browser, and a wrong token keeps the server from starting.

Check it: after the start, the tunnel's external address appears in the server header.

Addons from the garrysmod/addons folder are turned on and off on the "Addons" tab, and workshop items only as the whole collection (step 2). A mode is also picked with "Make active" on the "Gamemodes" tab. Changes on both tabs apply at the next server start.

How friends join the server​

Send your friends the external address from the server header. In the game they open the console with ~ and enter the whole address:

connect 203.0.113.10:41234

If the console doesn't open, add -console to the game's launch options in Steam. If friends can't join, open "Friends can't connect".

If you run the server yourself​

Point the tunnel at this computer's address on your home network, for example 192.168.1.20, not at localhost: a Garry's Mod server refuses players who come from 127.0.0.1, and a tunnel to localhost brings them from exactly there. On Windows, the computer's home network address is the IPv4 line in the output of:

ipconfig

Create a UDP tunnel with the destination address 192.168.1.20:27015: another device or server.