The Windows Firewall with Advanced Security local firewall rules must not be merged with Group Policy settings when connected to a public network.

From Windows Firewall with Advanced Security Security Technical Implementation Guide

Part of Windows Firewall Public - Local Firewall Rules

SV-54917r3_rule The Windows Firewall with Advanced Security local firewall rules must not be merged with Group Policy settings when connected to a public network.

Vulnerability discussion

A firewall provides a line of defense against attack. To be effective, it must be enabled and properly configured. Local firewall rules will not be merged with Group Policy settings on a public network to prevent Group Policy settings from being changed.

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If the system is not a member of a domain, this is NA. 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 firewall rules:" to "No".

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