I think i can help you out here. I was running in to same issue and i had checked out almost everything and had tried out all possible solution that i could have but i was just running out of luck. However, while looking after a fix for this issue in other forum one guy suggested me to disable the proxy server inside the LAN settings. I did that and utorrent and firefox were able to connect to internet after that. I haven't any issue since disabling proxy server inside the LAN settings. Just give it a try and let me know if that helps you out as well
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