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The Windows Firewall with Advanced Security must block unsolicited inbound connections when connected to a private network.


Finding ID Version Rule ID IA Controls Severity
V-17428 WNFWA-000012 SV-54879r3_rule High
A firewall provides a line of defense against attack. To be effective, it must be enabled and properly configured. Unsolicited inbound connections may be malicious attempts to gain access to a system. Unsolicited inbound connections, for which there is no rule allowing the connection, will be blocked on a private network.
Windows Firewall with Advanced Security Security Technical Implementation Guide 2016-10-28


Check Text ( None )
Fix Text (F-63499r1_fix)
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) -> Private Profile Tab -> State, "Inbound connections" to "Block (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 privateprofile firewallpolicy blockinbound,allowoutbound".
"Netsh advfirewall set allprofiles firewallpolicy blockinbound,allowoutbound".
Both inbound and outbound parameters must be specified to execute this command.