Need to block network users from being able to access BitTorrent (BMTORRENT). I have a Sonicwall TZ-215 along with the premium content filtering. I can block the URL of the usage, but can not determined the proper ports to target the service to block.
Goal is to not have to upgrade to the "Application Control" that can detect the signature of the traffic or such. I am fine with blocking the defaults or making more difficult for the person. I understand that they could use other methods to avoid detection.
Bittorrent uses TCP to transfer files and UDP for searching. It will use port 80 if the default TCP ports 6881-6889,6969 and 8080 can not be reached. Some bittorrent clients also support HTTP downloading.To completely block BT, you must block UDP ports 1024-65534 in your router.
So like you see it's a lot and it can affect your other software network traffic.
I think better way is to block application using registry or Group policy
Here you can find fine article about it
https://www.howtogeek.com/howto/8739/restrict-users-to-run-only-specified-programs-in-windows-7/