Steam “Connect” Protocol


I currently have a link set on my website to run the following


When it runs, it launches Insurgency Standalone but it doesn't connect. If a person uses connect in the Insurgency console it works fine;

This works locally if I put it as


Which is the local IP that this server is being hosted on.
Ports are forwarded in Windows Firewall & on Gateway, server displays fine on the in-game server browser and sites such as gametracker display the server fine too.

If I click the link on the website to initiate the connection file then it launches the game and joins no server, it just sits at the menu; but if I Alt+Tab out and click the link again, it connects to the server once it's maximized again.

It's just the original steam://connect/ that won't work what-so-ever.

The server itself is connected to my own AD Domain with DNS set up.

Any ideas as to what is happening here?

Best Answer

Did you forward just this one port or all ports listed here:

The connect string you supply will, indeed, cause the server to be polled by UDP on port 27016 by Steam. This makes sense why the client can then determine what game to launch (how it knows that you want Insurgency rather than HL2:DM or some other Source game).

It could be that the client may attempt to communicate on another port and fail; but the server browser will still work.

The connection working after the program is already launched is an odd behavior, but it may be that a different bootstrap mechanisms are used when the game is already running - one that's more aggressive. Or possibly, it's a side-effect of attempting to connect twice (perhaps the NAT is in a different state for the 2nd attempt - see