Hi SoftDux-Rudi, I am new on the forum but might be able to help. I have just set up a media server streaming through my xbox360 with FreeNas 7.
In FreeNAS Admin > Services > UPnP
Make sure your Upnp Name has a : at the end or the xbox will always come up with no videos found (Very important)
Make sure you set the database directory and check the box and set the directory for transcoding
Check the box for WebGUI
make a note of the URl provided (Should be
http://ip address:49152)
save and restart
In your web browser enter the URL
http://ip address:49152
this should take you to Fuppes
click options on the left
then rebuild database or update database
once this has finished click rebuild virtual database.
You should now be able to access and view your media server on the xbox 360. This is all the information that helped me that a searched the internet for.
Baz