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Domain Controllers (2): Samba 4

Client: Windows 10 1909 x64

After joining a computer to the domain, when I run gpupdate /force for the first time, the values under these keys are deleted:

HKLM\SOFTWARE\Policies
HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies

This doesn't seem to happen if I re-import the keys and run the update again (need to test this more). It also doesn't happen in a test domain (with only a few GP settings configured), so there must be some GPO setting that's causing this.

I noticed because the Secure Desktop wasn't coming up when requiring elevation, which is controlled by the policy User Account Control: Switch to the secure desktop when prompting for elevation (key located at HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\PromptOnSecureDesktop). This is set by default on new Windows installations.

I pasted gpsvc.log here: https://pastebin.com/CkcPkCCA (15:26 is when I ran the command)

Does anyone know what could be causing this behavior?

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That is the expected behavior. If a registry policy hasn't changed since it was last applied, it isn't re-applied. It isn't occurring on subsequent applications of group policy due to you do not have the registry policy processing setting enabled to "Process even if the Group Policy objects have not changed".

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  • gpupdate /force does process the complete policy, even if it didn't change. – Daniel Sep 27 '20 at 13:44
  • I narrowed it down to one GPO that causes this. I deployed a new vm, added it to a test OU (with 3 GPOs linked), made a snapshot before running gpupdate (/force doesn't change anything). Removed one by one and it only deletes the existing keys when the one called Windows10 is applied. I may be misunderstanding how GP works but I thought it wasn't supposed to delete existing keys, only add/change the ones you configure on the GPO. – Bangaio Sep 28 '20 at 11:34

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