Rules for applications — simple rules defining how the firewall will behave during network communication in trusted areas and in the Internet. These rules are generated automatically. This process is based on the user's reactions to dialogs regarding unknown network traffic. For details see below.

Advanced Packet Filter — detailed rules for network communication (optional configuration of IP addresses, protocol, ports, application, etc.). Rules for packet filters can be either defined by hand in the Kerio Personal Firewall configuration dialog or generated automatically according to user's reactions to connection alerts (for details refer to chapter 5.2. Connection Alert (unknown traffic detection))

Advanced packet filter configuration is described in detail in chapter 8. Advanced Packet Filter.

Predefined network security rules — Kerio Personal Firewall includes set of predefined rules which are independent from individual applications. For these rules, only actions which will be taken can be set (allow or deny rule). Predefined rules can be either enabled or disabled (one option for all the rules). For details refer to chapter 7.3. Network Security Predefined Rules.

The network security module can be enabled/disabled through the Enable Network Security module option in the Applications tab of the Network Security section. If the option is unchecked, all described rule types are unavailable.