Why isn't my server showing up in the master list? - Router is causing problems.

When I create a listen server in Gmod without my router, my server shows up on the master server list, so people can join me and have a good time. :slight_smile:

But when I connect my router, something is jamming it, my friends can join me via IP, but my server is listed local on my pc. :S

I forwarded ports 27000 - 27050 TCP and UDP, so I think that should work.
Also I put off the firewall on my router, and NAT is on.

What makes my server not show up on the master server list? is there another port I need to open?
I really hope someone can fix this!
Greetings from Vortex :wink:

Anyone :lol: ?