Gmod Ports - Listen server

Hey i would like to know if anyone here knows how to open ports for garry’s mod aka Half life 2 (listen server). With router ofc.

I got an D-link (dir-615) router.

I’ve opened ports 27000-27039 for both UDP and TCP.

Still refuses to work properly.

// If this is the wrong section please move it to the right one.

PS: I’ve opened ports for Counter Strike (not garry’s mod) i though it would’t really matters tho due to valve uses the same ports for all HL - HL2 games… Corecct me if im wrong :stuck_out_tongue: