Unknown Error -150000 when streaming music to Apple TV from an iMac

Hi,
I have a -150000 unknown error on my iMac G4 (ITUNES SERVER) when I try to stream music to my Apple TV over WI FI. If I use an ethernet connection - there is no problem. I can also select and play the iMac's music VIA the Apple TV interface using WI FI.
To summarise
iTunes Server to Apple TV via WI FI -- Does not work
Apple TV to iTunes Server via WI FI -- Works
iTunes to Apple TV via Ethernet -- Works
A MacBook to Apple TV via WI FI/ Ethernet -- Works
A Macbook to the iTunes server to Apple TV via WI FI -- Works
so I can select and play music from my iTunes server via my MacBook and play it on the Apple TV, I just can't do it directly. I have done all the patches etc. All macs have iTunes 8.02 Leopard 10.56 ( they recently been updated, but the problem existed prior to updates ) and Apple TV is now on 2.1 .. it has been on 2.3 without success.
I do think there is something within the iTunes Server settings.
This iMac (iTunes Server) has over 80 DAYS of music -- some 15,000 long classical music pieces. The music is stored on an external 3TB hard drive. This is only about a 3rd of my collection. I still need to add more. Would this be a problem?
Also most of the music was imported from an iTunes library that was originally created using iTunes 7.0. I did not have a problem then. I am tempted to go back to iTunes 7.0, but I think this will not be possible.
Many thanks in advance for any help and / or suggestions

I believe this issue has to do with firewall settings. I set up my ATV on Thursday. After I finally got around the port 3689 error (by taking my firewalls down), everything, including AirTunes, was working. However, when I re-established the firewall by customizing the port permissions, AirTunes would not work. Today I took the firewall down again and amazingly AirTunes worked. The fix - I had to open the firewall software and allow iTunes to allow iTunes.exe to allow outgoing TCP/UDP traffic.
Hope this helps. I am a PC user, but perhaps this will point MAC users in the right direction as well. Good Luck.

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