Event ID 856 – The Windows Firewall setting to allow unicast responses to multicast/broadcast traffic has changed.
When the Windows Firewall settings for allowing unicast responses to multicast or broadcast traffic are changed, event ID 856 is logged by Windows. Such a change is usually instituted by an administrator or a group policy refresh.
This log data provides the following information:
- Policy Origin
- Profile Changed
- New Settings
- Old Settings
Why does event ID 856 need to be monitored?
All changes with regards to Windows Firewall need to be monitored as unplanned or unauthorized changes need immediate investigation. It could be a sign of malicious activity.
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 856 applies to the following operating systems:
- Windows 2003 and XP
Corresponding event ID in Windows 2008 and Windows Vista is 4950.