Question : Block Torrents

Not that I truly want to block torrents, but here at work it is something I need to consider.  How might I do it?  I know you can use clients that will use a range of ports.  our current set up is Windows 2003 SBS.  For the most part I'm confident that my proxy server blocks the required people, and web pages.  But not sure how to block this.  ANy help would be greatly accepted.

THANKS!!

Answer : Block Torrents

The most common bit-torrent ports you need to block are 6881 to 6889.  If you have a hardware firewall it would be best to block them on that.