Windows Server 2008 SP2.
In Application event log I can see many warnings:
Access to C:\Windows\system32\DllHost.exe has been restricted by your Administrator by the default software restriction policy level.
Access to C:\Program Files\Microsoft Monitoring Agent\Agent\MonitoringHost.exe has been restricted by your Administrator by the default software restriction policy level.
Both
Source: SoftwareRestrictionPolicies
Event ID: 865
User: SYSTEM
And another one warning message:
Access to C:\Windows\system32\wbem\wmiprvse.exe has been restricted by your Administrator by the default software restriction policy level.
Source: SoftwareRestrictionPolicies
Event ID: 865
User: NETWORK SERVICE
In System event log I found errors like that:
The processing of Group Policy failed. Windows could not evaluate the Windows Management Instrumentation (WMI) filter for the Group Policy object cn={06E7D6C5-6097-478C-9D56-994E9BA2D4B6},cn=policies,cn=system,DC=domain,DC=com. This could be caused by RSOP
being disabled or Windows Management Instrumentation (WMI) service being disabled, stopped, or other WMI errors. Make sure the WMI service is started and the startup type is set to automatic. New Group Policy objects or settings will not process until
this event has been resolved.
Source: GroupPolicy
Event ID: 1065
User: SYSTEM
System Center Operation Manager generated alert for this server: WMI is unhealthy. How does software restriction policy prevents restricted process run under the System account.
Domain softeare restriction group policy apllies to this server and all was fine before last sunday.