IMac Duo will not stream Quicktime behind my router.

Just bought a new iMac Duo it will not stream QT behind my Linksys router. Now I know this is a bug in QT and a port not being open for this new version of QT on the Duo because all other Macs I have work fine.
If I move the iMac Duo to a DMZ zone it will stream just fine.
Now what UDP or TCP port range do I need to open for this iMac Duo version of QT 7.0.4 to stream properly ?????
Thank you for your help.

Does this affect the system even without the firewall turned on? I don't have the firewall enabled (at least I think it is off - bear with me as this is my first Mac I noticed that neither the HTTP (port 80) nor UDP (port 554) work for my iMac, although my wife's iBook G4 and my other PC, an Athlon64 Windows XP box, play streaming Quicktime flawlessly over HTTP behind my NetGear DSL router. My iMac fails with connection error -5420.
All things considered, since I am a recent Mac owner (only had the thing for a about a week) and it is my first, I am very happy. I am just a bit disappointed in Apple for a problem like this since media technologies are their bread and butter.
Any more thoughts are certainly welcome.
Thanks,
Joshua
iMac Core Duo 1.83 GHz 17"   Mac OS X (10.4.4)  

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