"An error occurred while saving the first authentication settings"
From time to time, I get this error when modifying connection security rules in my GPOs. The error text is either "Access is denied" or "File not found". When you dismiss the message, the dialog closes like it saved. When opened, your changes appear to be successful. If you make a slight change and save again, no error.
That's been my experience over the past year and the actual GPOs seemed to deploy. A week ago, this was not the case, the new changes simply would not reflect. That was, until I toggled the changes back and forth and not get an error. Then, it applied.
I almost exclusively make changes via the MMC snap-in remotely. I've noticed it takes a bit longer to apply changes than if I did it directly on a DC. I've observed this while in the office and over VPN. I tried to procmon it. Changes take even longer and I've never reproduced it when running procmon.
Has anyone seen anything like this? dcdiag and repadmin don't report any issues, and there are no other observed problems. Running on Server 2019.