Alright I just set up rules for utorrent according to this guide:
https://forums.comodo.com/frequently_asked_questions_faq_for_comodo_firewall/tutorial_for_utorrent_with_comodo_firewall_3-t15677.0.html
How would I block all these by a global rule? Is it as simple as blocking all UDP with source port and destination port 500? Won’t that block other useful stuff?
It takes a small amount of work to create these rules. Somewhere on here it tells you the rules are read from the top down, so the first rule that matches the request is used.
All you need to do is make sure any rules for ports that need to be open for incoming traffic are placed before any block rules.
So, if you have a torrent client that uses port 50000 create a rule that allows tcp and udp in to port 50000 and put it near the top. if this is the only application that needs to have a port open for incoming traffic, you can create a rule below to block everything else, or be as selective as you want.
If you know which applications you use and what their requirements are, its easy to do. In a nutshell, most applications don’t need to have incoming ports opened explicitly, its mostly things like p2p that need this.