Upgrading iPhone software 3.0 through iTunes but won't update

I've been trying to update my iPhone software to 3.0 through iTunes on my home PC, but it keeps giving me an error message saying that the "software update server cannot be contacted. Check internet connection or try again later." My internet connect is active/fine, have already downloaded the latest version of iTunes (8.2), so what's wrong???

I think I've figured this out.
Using another PC on a different network, which doesn't have a restrictive firewall, and the synch to Gmail contacts worked...
I didn't think it was a firewall problem, because in the original attempt, I even used Wireshark to sniff the network traffic for the synchronization traffic. I only saw http traffic to the google servers, and that's not restricted...so I must have missed something in the network trace, but my guess is that the firewall (a cisco 5500 series) was blocking the authentication traffic. Perhaps it uses imap or some other protocol besides http or https, which would have been allowed.
I also log all dropped traffic in a syslog, and didn't see any entries corresponding to the synch, but again, I may have missed something.
So, at any rate, it is now working and I'm pretty certain it was the cisco firewall policy that was the problem.

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