garrys mod help


Frequent Poster
I really can not figure out how to make a server in gmod. I've looked at a lot of different guides and I can't get it to work. I'm just trying to make a server so that my friends and I can play in sandbox mode together.

I can make a server but none of my friends can ever join. Usually says server is not responding or disconnected after 4 tries. And I also made sure it wasn't me by having them make a server and me joining but it still doesn't work. You guys got any idea how to create a working garrys mod server?