AppleTV and Firewall - Streaming Problem

Hi All

I currently have 2 ATV1s which are both linked to iTunes running on a Server (Windows 2008 R2) via Streaming rather than Syncing. I have no issues with the connection until I enable the Fire Wall.

I have ebaled the following Ports TCP 123, 3689, 80, 443 and 53 with also UDP 5353. All are set to bidirectional. These were gleaned from the following support article http://support.apple.com/kb/HT2463. I am also looking down the list of "Well known TCP and UDP ports used by Apple software", but as yet can see nothing obvious.

With these ports open the AppleTVs are seen by iTunes and they can also see the shared library. This issue happens when I connect the AppleTV to the library, it starts to load the library and the drops the connection. Occationally it does manage to load the "directory" but then will drop out after a few minutes. When the ATV drops the connection on iTunes it is still showing as a Device. So it looks like the basic connectivity is in place, just missing a little part of the puzzle.

Without the FW in place everything works OK.

Is there any other PORT I need to enable? I would not really like to run a server without a FW in place even though it is behind a NAT router.

Any help would be appreciated.

Regards

Malcolm