Removing incorrect Firewall rule

I have Comodo Firewall running on 3 Windows PCs. Somehow I managed to create a rule on one of them that is blocking a particular program from running. (Program runs OK on the other PCs or if I disable Comodo firewall on this one)

How can I find that rule and remove it?

(program in question is TrendNet KVM Switcher)

Open up the firewall application rules and look for the application in the list. Application Rules, Firewall Protection, Best Firewall | Internet Security