ITunes sharing - using AirTunes and older Mac (Firewall)

iTunes lives on my 27" iMac and I would like share the library out to home computers. I plan to have an older iMac G4 publicly accessible so visitors can control the music on the home stereo. I can access iTunes via the iMac G4, I can get to my main library without problem. However, when I try to connect to my Airport Express Air Tunes I get a firewall issue. Specifically, the G4 gives me a message to change my firewall settings. The help information for itunes with Mac OSX Firewall tells me to click sharing ->Firewall ->iTunes Music Sharing ->Advanced -> deselect "Block UDP traffic." I have done this on the G4 firewall and the 27" firewall isn't even turned on. However, I am still not having any luck. Any ideas? FWIW, all software and OS are up to date.
My wife's MacBook Pro can connect to the AE Air Tunes.
Message was edited by: K J

Did you ever solve your problem? I just got a macbook with airport extreme card and then got an airport express mainly to play itunes through a stereo in another room. The macbook does this with no problem. However, I wanted to use an older powerbook G4 (867Mhz) with an airport (not airport extreme) card to run airtunes. The G4 gave me the same incorrect firewall warning even after I've changed the settings. Even with the firewall off, it only plays for a few seconds, then cuts out. I'm running 10.4.11 on the G4 and 10.6.2 on the macbook. I'm beginning to think the airport card just can't handle the bandwidth, even after I narrowed the multicast to to 1mbps.

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ITunes sharing - using AirTunes and older Mac (Firewall)

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