Event ID - 4866

Event Id4866
DescriptionA trusted forest information entry was removed.

      Security ID: <Security ID>
      Account Name: <Account Name>
      Account Domain: <Domain Name>
      Logon ID: <Logon ID>     

Trust Information:
      Forest Root:<Forest Root>
      Forest Root SID: <Forest Root SID>
      Operation ID: <Operation ID>
      Entry Type: <Entry Type>
      Top Level Name:<Top Level Name>
      DNS Name:<DNS Name>
      NetBIOS Name:<NetBIOS Name>
      Domain SID: NULL SID

Event InformationCause :
This event is logged cross-forest trust relationships are deleted or modified.
Resolution :
This is an information event and no user action is required.
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