Server hosting

I’ve tried everything; Port forwarding, disabling firewalls, all that sorts of stuff. I simply can not host a server that people can actually join.

I’ve noticed that i’m fully able to host a server for L4D and I use to be able to for gmod, it doesn’t work now though. Anyone know a solution? I’m trying to run a simple listen server.

you may need to specify your external ip as well as a port when you tell your friends to connect.