IMac intel : streaming QT doesn't work

Hi!
I'm not able with my imac intel to see QT live streaming events (like Keynotes of Jobs).
Before, with my iMac G5, the streaming QT worked well...now I've not changed any parameter of modem but the streaming doesn't work more.

I have the same problem. QuickTime streaming is not working and I am unable to use iChat AV (video chat).
My iMac Core Duo is behind a router, has a fix IP address and is connected to the router via ethernet cable.
I tried to switch the QuickTime streaming setting from automatic to port 80 (http) with no success.
Changing the set up of the router and placing the iMac into the DMZ solves the problem (but creates an other problem, within the DMZ the iMac is exposed to the internet, nothing I like to do).
Just forwarding port UDP 554 to the iMac doesn't help, the iMac has to be in the DMZ.
I have the impression that at some point in the initial communication between client and host a bit order error occurs and a wrong port number is used by Mac OS X on Intel.

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