I am trying out the Kerio firewall. There is a section where you can predefine network security rules (see pic). Right now I have set all rules to their default settings. Please note that some of these the default Internet setting is "Permit". I have tried setting all of them to "Deny", and have not noticed any connectivity problems, but maybe I'm missing something. My question is - does anyone see any reason to allow the ones currently set to "Allow"? Are there any practical security risks by keeping any of them set to "Allow"? P.S. I speak above of "Internet" network settings. I am not concerned with keeping any of the "Trusted" network settings to "Allow"