Argh!
The
exact same thing (almost) is happening to me!
I'm also behind a proxy server, and everything else network-related works, etc. I've tried switching internet connect configurations, re-entering proxy information, and switching to automatic proxy configuration. Nothing has fixed the problem.
The only difference in my case is that I can actually access the store but I can't access my shopping cart.
My specs are below. When it first started I was very happily using iTunes 6.0.4, and had no desire to update, but the log in to proxy error forced me to upgrade to 7.3.2 (6) in the hope it would fix the problem (but of course it didn't).
Please, please, would one of you fine and intelligent Top Users suggest a fix?
Cheers
rob