Listen server not working?

Hey guys, I posted a thread a while back asking how to create listen servers, and you all told me to disable my firewall and open port 27015 on UDP and TCP. I did both, and I still do not see my games on the “Online Games” list in Gmod. I made sure the the LAN box was unchecked… Any suggestions?

You forgot port 27005. I had this same problem too.