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“connection closed by peer”
Not a lot is known about the specifics of this error message, aside from it being prevalent with users of Windows Vista and XP users alike. It could be a Firewall/security issue, port forwarding problem, or an ISP that throttles BitTorrent traffic.
One possibility is that your ISP has capped your connection, or even blocked ports. Some users have noticed that they generate this “connection closed by peer” error message when downloading torrents that have a port number in the announce URL. (Note the port number “80″, as used by ThePirateBay tracker):
— http://tpb.tracker.thepiratebay.org:80/announce
One solution/workaround for this is to download torrents from trackers that don’t use a pre-defined port (i.e. - this mininova tracker):
— http://tracker.mininova.org/announce
Another possible solution is to make sure that your traffic is encryption-enabled. In µTorrent - go to Options > Speed Guide… and look to the bottom left of that window. Be sure there’s a checkmark where it says “Enable Encryption”. Also, check that DHT is enabled. Go to Options > Preferences… > BitTorrent and make sure these items are checked:
BitTorrent Client Error Messages (Tracker Errors) | THE source for BitTorrent & P2P Tips, Tricks and Info. | FileShareFreak