The Windows Firewall with Advanced Security must allow outbound connections, unless a rule explicitly blocks the connection when connected to a domain.

From Windows Firewall with Advanced Security Security Technical Implementation Guide

Part of Windows Firewall Domain - Outbound

SV-54863r3_rule The Windows Firewall with Advanced Security must allow outbound connections, unless a rule explicitly blocks the connection when connected to a domain.

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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The preferred method of configuring the firewall settings is with a policy, particularly in a domain environment. 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)". In addition to using policies, systems may also be configured using the firewall GUI or Netsh commands. These methods may be more appropriate for standalone systems. The configuration settings in the GUI are the same as those specified in the policy above. Windows Firewall Properties will be a link in the center pane after opening Windows Firewall with Advanced Security. The following Netsh commands may also be used to configure this setting: "Netsh advfirewall set domainprofile firewallpolicy blockinbound,allowoutbound". Or "Netsh advfirewall set allprofiles firewallpolicy blockinbound,allowoutbound". Both inbound and outbound parameters must be specified to execute this command.

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