Well, the title is only partially true. I'm running SRCDS on my win7 computer. I've got SM/MM and various plugins working just how I'd like, but none of my friends can find the server in their steamgroup server list. I see it in mine, but I presume that's because I'm on the same network as the server.
Is there some odd port that the server needs to communicate out and in on? Is my config (hopefully attached to this message) b0rked in some weird way? Originally I only had three master servers in my list, but I tried adding a ton more I found on the Steam forums. Didn't seem to do any good.