Garry's Mod Server.

[Angstrom]

Hello there.
I'm trying to play with one of my friends in a Gmod server made by me. By this I mean I just click on "Start Multiplayer". Thing is he's never able to see my game (Does not respond) and the only way to make it work is using Hamachi, which gives him a tremendous ping.
Anyone here has any idea about what to do?
Thanks in Advance.

 

[Activate]

1) Is it a local server you made yourself.
2) Do you have your ports forwarded?

 

[Angstrom]

Problem solved! Had to open ports 27015 - 27020.