Add An Exception For Utorrent In Windows FirewallĪn IPS could put a threshold on the number of incoming and outgoing connections, since Bittorrent clients need to connect to multiple peers (and have multiple peers connect to them) in order to function.If your concern is the legality of the shared content (or if you plan on taking any action against your users), then your best defense is a well-written acceptable-use policy outlining the users' responsibility for their actions and forbidding the use of file-sharing software.
A firewall could prohibit incoming connections to your user subnet, while permitting them to your intended outward-facing services. As a peer-to-peer protocol, peers outside your network need to connect in. Quality-of-service (QOS) control and bandwidth caps for endpoints could limit the impact the Bittorrent users are having on your overall bandwidth, without the cat-and-mouse game of trying to block a particular protocol.Another approach would be to block the types of connections that Bittorrent requires. The standard ports are 6881-6889 TCP, but the protocol can be run on any port, and the peer-to-peer nature of the protocol means that discovering peers that use unblocked ports is simple.Blocking Bittorrent traffic could be done with a deep-packet-inspection or application firewall, but many Bittorrent clients support encryption that makes DPI less effective.If you own the network and bandwidth is your big issue, then you would be best served by a bandwidth monitoring solution. Blocking Bittorrent is challenging, and can't really be done effectively with port blocks.
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