Intra-forest AD migration: One more pre-requisite to consider

After doing intra-forest migrations for many years, I recently discovered some new pre-requisite which I would like to share in this article. It all started with the following computer migration error: “Error 0x000021C7. The operation failed because SPN value provided for addition/modification is not unique forest-wide.” User migrations are failing as well referencing duplicate UPNs. This is where I started digging.

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Handling “Remote Registry” service as part of QMM RUM requirement

QMM RUM always had a requirement for the “Remote Registry” service to be running on migrated computers but starting with Windows 8 / Server 2012 Microsoft has made it a bit more challenging for the migration engineers to handle. Even if you set it to “Automatic” and start, it will eventually be stopped by OS and Startup Type will reflect Automatic (Trigger Start) so QMM RUM will keep complaining about it.

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