Local firewall connection rules for the Windows Firewall must not be merged with group policy rules for the Public Profile.

From Windows 7 Security Technical Implementation Guide

Part of Windows Firewall Public - Local Connection Rules

Associated with IA controls: ECSC-1

SV-25245r2_rule Local firewall connection rules for the Windows Firewall must not be merged with group policy rules for the Public Profile.

Vulnerability discussion

A firewall provides a line of defense against attack. To be effective, it must be enabled and properly configured. Merging local firewall connection rules with group policy firewall rules may weaken intended group policy firewall configurations.

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Fix text

Configure the policy value for Computer Configuration -> Windows Settings -> Security Settings -> Windows Firewall with Advanced Security -> Windows Firewall with Advanced Security -> Windows Firewall Properties (this link will be in the right pane) -> Public Profile Tab -> Settings (select Customize) -> Rule merging, "Apply local connection security rules" to "No". Configure a comparable setting if a third-party firewall is used.

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