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Not sure what's going on, only to say it's infuriating. I'm using a custom-built Windows 7 64-bit PC with a Netgear modem. Recently, I lost internet connectivity because a lightning strike hit the street cabinet. To remedy this while the problem was fixed, I used a mobile 3G broadband stick from another company. I've since uninstalled that and am back using my wired connection.

During this time, I noticed that a Gmail client on my desktop that I use to check email wasn't connecting to Google's Mail servers. I also noticed that the application Whatpulse wasn't able to connect to its respective server. I didn't think much of either and I certainly didn't tie them together into one problem.

Now, 2 weeks later, 1 week after getting a wired internet connection back, I cannot access any of Apple's update servers to download iTunes, an iPhone software update, etc.

Now I've realized it's likely part of a larger problem.

I can access the internet fine through all my browsers, uTorrent can download .torrent files without issues, I can even navigate to iTunes website, Whatpulse, gmail.com. It's just these applications can't.

I suspect the 3G mobile connection I used during the week is at fault. I think it's changed some network setting somewhere, but I wouldn't have a clue what. I know it's not my internet connection or my modem, since I can use my MacBook over WiFi to update iTunes via Apple software update. The issue is therefore restricted to my PC.

UAC is turned off, I'm under an administrator account, my hosts file is empty.

Any ideas? This is extremely annoying.

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Since you imply that the 'restriction' seems to apply to certain software, have you tried uninstalling the software and re-installing them? –  Darius Oct 6 '13 at 2:43
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