What Network Firewall Ports Needed For Music Store?

My PC is on a network that is firewalled to the the Internet. All ports are blocked except for those explicitely enabled, such as port 25 for E-mail, port 80 for browsing, etc.
When the Windows Firewall is disabled, my PC cannot get past the the Music Store's home page. All links are inoperative.
When I connect my PC to another router/firewall, that bypasses my network's firewall, I can navigate the music store.
I believe I have a blocked port issue when the PC is connected to my network.
Can anyone tell me what Internet/TCP ports I need to have open for the iTunes music store and for QuickTime?
Thanks for the assist.
Regards.

hiya!
Since you say that iTunes is using standard browser ports, then perhaps it's my network's Proxy Server that iTunes doesn't work well with.
it might be worth checking on these possibilities:
iTunes for Windows can't access the Internet if proxy settings are incorrect
... but also see:
iTunes for Windows: Music Store - Using With Internet Filters or Accelerators
love, b

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