How do i only allow iTunes traffic through the firewall

I have to lock down a Cisco 877's zone based firewall to only allow iTunes music store and iPhone activation traffic through without allowing web browsing traffic.

iTunes traffic runs on port 80 and 443, so i can't just allow those through and i can't seem to find any information on IP addresses / hostnames etc.

Please Help!!

Thank you all in advance!
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If you have a look here.. it lists all the ports that apple use.. remember to make sure you allow these ports on both your router/firewall as well as local firewall on your computer if you are using one..

Sorry i miss red your question.. if the machines are on a windows domain you could create a GPO that would only allow 'itunes.exe' access and block port 80 on all other services.

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