Policy Change Event: 855

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Process Tracking » Policy Change Event: 855

Event ID 855 – A Windows Firewall ICMP setting has changed.

Event ID 855
Category Policy Change
Type Success Audit

ICMP stands for Internet Control Message Protocol. When the ICMP settings of Windows Firewall are changed, event ID 855 is logged by Windows. Such a change is usually instituted by an administrator or a group policy refresh.This event describes which settings have been enabled and which have been disabled.

This log data provides the following information:

  • Policy Origin
  • Profile Changed
  • Interface
  • New Settings
  • Old Settings

Why does event ID 855 need to be monitored?

  • To check if the settings defined for the Windows Firewall are in line with the established standard settings
  • To monitor all changes made locally to Windows Firewall settings

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. TThe 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 855 applies to the following operating systems:

  • Windows 2003 and XP

Corresponding event ID in Windows 2008 and Windows Vista is 4950.

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