True, it's always a possibility that your ISP is at fault, but I don't think you would've been lucky enough to slip through their throttling/blocking even once if it were a global thing... I don't have any *actual* better explanation myself, but that's just my view on that. So let's try this... 1. Uninstall your firewall (again if you reinstalled it) 2. Enable Windows Firewall (it should be able to let µTorrent through, assuming you set µTorrent to add the Windows Firewall entry) 3. Disconnect your router, and connect your modem directly to the computer If this works, then it's not your ISP, but some configuration issue, or probably a crappy router (I'm assuming you have no other security software that would block connections here).