Port for Steam Masterservers?

[King John]

Hello,

I am running a Gmod server (Latest) and, for some reason, I cannot get it to list on the master server. I'm guessing that I have to forward some ports to the server to get it to work good, but I could be wrong. I know my ISP doesn't block the ports, because they don't even block FTP or HTTP. I forwarded ports 27000 to 28000 and still no luck. Any ideas?

[Beaverbeliever]

Remember that if you are running the server on your LAN, it will not come up on the master list for you. This is blocked by Steam. However, you can see it on the Lan tab in the server browser.

Most likely, other people can see it just fine in the master server list