Which random port for UPnP/DLNA?

[shikasta]

Hi, does anyone know how subsonic chooses it's random port for DLNA connection, or better yet, how to tell it which to use?

I know UPnP discovery port is 1900, but I need to know the one that is somewhere between 30000 and 70000. Subsonic changes listening port every restart and the only way I can connect to subsonic's DLNA reliably is to allow the entire range through iptables, and I really don't like this.