For the past three days, whenever I start a listen server for my friends, it gets stuck on my local IP, 192.168.1.127.

I have tried ip <external IP>, sv_lan 0, sv_master_legacy_mode 0, etc. yet no matter what the IP remains at 192.168.1.127.

When my friends view my game info and try to connect, it says "Not responding" and the IP is listed as 192.168.1.127:27015. So the game is not broadcasting on the external IP, it seems.

Appropriate ports are forwarded, no DMZ, the mod's hl2.exe is allowed through the firewall.

Any suggestions? We really want to play this.