This security policy setting determines whether the operating system generates audit events when changes are made to policy rules for the Microsoft Protection Service (MPSSVC.exe), which is used by Windows Firewall. The tracked activities include:

• Active policies when the Windows Firewall service starts. 
  
• Changes to Windows Firewall rules. 
  
• Changes to the Windows Firewall exception list. 
  
• Changes to Windows Firewall settings. 
  
• Rules ignored or not applied by the Windows Firewall service. 
  
• Changes to Windows Firewall Group Policy settings. 
  

Changes to firewall rules are important to understand the security state of the computer and how well it is protected against network attacks.
Event volume: Low
If this policy setting is configured, the following events are generated. The events appear on computers running Windows Server 2008 R2, Windows Server 2008, Windows 7, or Windows Vista.

• 4944: The following policy was active when the Windows Firewall started.
  
• 4945: A rule was listed when the Windows Firewall started.
  
• 4946: A change has been made to Windows Firewall exception list. A rule was added.
  
• 4947: A change has been made to Windows Firewall exception list. A rule was modified.
  
• 4948: A change has been made to Windows Firewall exception list. A rule was deleted.
  
• 4949: Windows Firewall settings were restored to the default values.
  
• 4950: A Windows Firewall setting has changed.
  
• 4951: A rule has been ignored because its major version number was not recognized by Windows Firewall.
  
• 4952: Parts of a rule have been ignored because its minor version number was not recognized by Windows Firewall. The other parts of the rule will be enforced.
  
• 4953: A rule has been ignored by Windows Firewall because it could not parse the rule.
  
• 4954: Windows Firewall Group Policy settings have changed. The new settings have been applied.
  
• 4956: Windows Firewall has changed the active profile.
  
• 4957: Windows Firewall did not apply the following rule:
  
• 4958: Windows Firewall did not apply the following rule because the rule referred to items not configured on this computer: