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Failed to open Group Policy Object

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Hello all,

I am receiving a strange error message that I have never seen before in Group Policy. I am attempting to edit a GPO and I receive the following message:

"Failed to open the Group Policy Object. You might not have the appropriate rights."

"Details: The volume for a file has been externally altered so that the opened file is no longer valid."

I have looked online and have found very little about this message. Most of the things I come across relate to the local group policy, but my issue is occurring in the GPMC on a domain controller.

I have three domain controllers - Server 2008 R2, Server 2012 Standard, and Server 2016 Standard. I can edit this GPO on my Server 2008 R2 domain controller, but receive the error message on the other two.

I have tried this solution from my research, but it seemed to cause more problems than it fixed and didn't remedy the original issue:

  • Get GPO GUID: from Group Policy Management Console (GPMC) –> choose GPO –> from right pane go to Details tab –> go to Unique ID field.
  • Open the path: C:\Windows\SYSVOL\sysvol\<Domain>\Policies\<GPO GUID>\User
  • Delete “registry.pol” file.

Has anyone see this before?

Thank you!


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