Policy Change Event: 851

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The Who, Where and When information is very important for an administrator to have complete knowledge of all activities that occur on their Active Directory. This helps them identify any desired / undesired activity happening. ADAudit Plus assists an administrator with this information in the form of reports. In real-time, ensure critical resources in the network like the Domain Controllers are audited, monitored and reported with the entire information on AD objects - Users, Groups, GPO, Computer, OU, DNS, AD Schema and Configuration changes with 200+ detailed event specific GUI reports and email alerts.

Process Tracking » Policy Change Event: 851

Event ID 851 – A change has been made to the Windows Firewall application exception list.

Event ID 851
Category Policy Change
Type Success Audit

Any change made to the Windows Firewall application exception list triggers event 851. The change in the list can be of any type—it can be the addition, modification, or deletion of an application exception. These changes are generally instituted by an administrator or a group policy refresh.

This log data provides the following information:

  • Policy Origin
  • Profile Changed
  • Change Type
  • New Settings - Name
  • New Settings - Path
  • New Settings - State
  • New Settings - Scope
  • Old Settings - Name
  • Old Settings - Path
  • Old Settings - State
  • Old Settings - Scope

Why does event ID 851 need to be monitored?

  • To monitor the new application exceptions which were created locally
  • To monitor the application exception modifications which were carried out locally
  • To monitor all deletions of Firewall application exceptions which were done locally

Pro Tip:

ADAudit Plus helps you avoid the GPOs monitoring complexities with real-time pre-configured reports and auditing of the changes along with alerts within a Domain & OU. The advanced Group Policy settings real-time audit reports highlight the elusive change details, and also provide the old and new values of the modified attributes.

Event 851 applies to the following operating systems:

  • Windows Server 2000
  • Windows 2003 and XP

Corresponding event IDs in Windows 2008 and Windows Vista are 4946, 4947, and 4948.

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