Listen server help

Dont Flame please, i have been through many threads and to no avail, it isnt working yet.
I have tried PortsForward and nothing happened.
I have a DI-524 D-Link Router. Could anyone please help, i just want to run a 2 player gmod server for a friend and i.

Been having this same problem…I’ve been able to host fine, until boom. I cant. I’ve made sure my ports are forwarded.

Check this Youtube video out. You DON’T have to run a dedicated server, this video will just show you how to forward your ports.