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Event ID: 1000 Source: Userenv

Source
Level
Description
Windows cannot do loopback processing when the computer is joined to a downlevel domain or is a member of a workgroup. Loopback processing will be disabled.
Comments
 
As per Microsoft: "Group Policy applies to the user or computer in a manner that depends on where both the user and the computer objects are located in Active Directory. However, in some cases, users may need policy applied to them based on the location of the computer object alone. You can use the Group Policy loopback feature to apply Group Policy Objects (GPOs) that depend only on which computer the user logs on to. Loopback is supported only in a purely Windows 2000 based environment. Both the computer account and the user account must be in Active Directory. If a Microsoft Windows NT 4.0 based domain controller manages either account, the loopback does not function. The client computer must be a Windows 2000 based computer". See ME231287 and ME823862 for more details.

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