The Windows Firewall must allow outbound connections, unless a rule explicitly blocks the connection for the Domain Profile.

From Windows 7 Security Technical Implementation Guide

Part of Windows Firewall Domain - Outbound

Associated with IA controls: ECSC-1

SV-25221r2_rule The Windows Firewall must allow outbound connections, unless a rule explicitly blocks the connection for the Domain Profile.

Vulnerability discussion

A firewall provides a line of defense against attack. To be effective, it must be enabled and properly configured. Outbound connections are allowed in the domain, unless a rule explicitly blocks the connection. This allows normal outbound communication which could be restricted as necessary with additional rules.

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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) -> Domain Profile Tab -> State, "Outbound Connections" to "Allow (default)". Configure a comparable setting if a third-party firewall is used.

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