rhythmbox, UPNP, firewalls etc.

[Jud Craft]

Hey.  Two problems when using Rhythmbox's UPNP plugin.

1.  How can I open up the Fedora firewall correctly?  I've seen posts
that in forums (eg. Ubuntu) that say open port UDP-1900, but I tried
this and I still can't see my friends in the network (as opposed to
firewall-off, when I can see them just fine).

2.  When I turn my firewall off to share my Rhythmbox, my
Windows-using friends can't access it.  They see it on the network but
it's just a strange device, rather than a Media Device readable by
Windows Media Player.

So how do I actually get this stuff to work?  I was under the
impression that this should be relatively easy.