Ports for Bittorrent
6881-6889 tcp
http://www.dessent.net/btfaq/#ports i uses 6881-6889 on the port forwarding from outside to my virtual machine
inside to outside i just put 1024:65535 in.. i dont care as it is a vm and i have a cleanstate snapshot.
nevertheless if you use the ranges on both rules it should work
test by disabling intrusion prevention to see if this was the case. then we could dig deeper into snort.
reboot the machine to the rules is really in place.
cheers armin
PS. if its a physical bittorent connect it to dmz and forward all ports in/out... make a clone before ;-)