network access to Serviio server

I recently had to move my XBox 360 out of the main intranet, onto it's own subnet in a DMZ due to game playing issues. I'm am using a Smoothwall router. To allow the XBox access to the Serviio, I need to open some ports to the Serviio. I've opened TCP 8895 and 23424 and UDP 1900. When I stop and restart the Serviio server, it will appear on my XBox as a media source. When I try to access it I get an error message that it's being blocked by a firewall. The Serviio console lists the XBox 360 as an enabled device at it's new IP address. It would appear that some other ports need to be opened in addition. I can't find any other info on port forwarding for Serviio other than those three ports. Any suggestions?