UPnP vs. Fedora 14 firewall

[Mike Wohlgemuth]

I have several different services on my network that use UPnP, and none 
of them seem to work unless I disable the Firewall on my Fedora 14 
desktops/laptops.  Everything I've read says that I should be able to 
allow UDP on port 1900, but that doesn't seem to help.  Can anyone tell 
me or point me to documentation about what I need to enable to let my 
Fedora 14 machines to see the services via UPnP?

Thanks
Mike