If you are using uTorrent for file sharing, or any bit torrent client for that matter, you should make sure that you only allow encrypted traffic. By encrypting the traffic, you make it harder to get detected. Also, many ISPs try to block bit torrent client to save bandwidth and legal troubles.

If you are using uTorrent (my personal favorite) here's how to encrypt your traffic. In uTorrent go to Options > Preferences > BitTorrent then select "Protocol encryption". You can choose between "enabled" and "forced". If you choose "enabled", you will get more connections but less protection. For maximum protection, select "forced".