On my office LAN, i can connect to ITMS on my PC but not my Mac. On the Mac I get a message saying that iTunes could not connect to the music store and to make sure I am connected to the internet. I am connected to the internet. The firewall is not blocking the site as my PC can access it over the same network. I do go through a proxy server, though this clearly allows the site also. Any ideas? Incidentally, I can connect to iTunes store on my Mac via dial up from my appartment.