I'm trying to figure out what to change/tweak to enable UPnP on my MythTV box.

I just got a PS3.
I can browse the Samba Share via a username/password combo from a PC.
The two machines are on the same subnet.
The PS3 scans the network and can't find MythTV box.

I want to make sure that the MythTV has UPnP enabled, but for the life of me, I can't find the setting anywhere in my setup. If it's something I can get to via the CLI, just let me know where.

Thanks all!