Can't promote a new 2019 server on existing domain

Thomas Anthony
Thomas Anthony used Ask the Experts™
on
I am adding a 2019 DC to my existing 2012R2 Single server domain in hopes to retire the 2012R2. I have added the 2019 to the domain and am in the process of promoting it do a DC and am getting an error of:
"Verification of replica failed. The forest functional level is not supported. To install a Windows Server 2019 domain or domain controller, the forest functional level must be Windows Server 2008 or higher."
I have checked and the level shows that the functional level of the 2012R2 is set to 2012. I have the primary DNS of the new server pointing to the old server, I have run DCDiag on the old server with no errors, and I am not getting any events in the logs that appear to be connected to my issue. Is there a "gotcha" that I may be missing?
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Scott SilvaNetwork Administrator

Commented:
Are you sure you checked forest functional level and not domain functional level?
Thomas AnthonySecurity Administrator

Author

Commented:
Yes but I did double check. Both levels show 2012R2 at the forest AND the domain. Thanks for the clarification though.
AlexA lack of information provides a lack of a decent solution.

Commented:
Have you done a domain prep?

so

ADPrep /forestprep

adprep /domainprep

Regards

Alex
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A lack of information provides a lack of a decent solution.
Commented:
Also, I assume you've moved from FRS to DFSR right?
Thomas AnthonySecurity Administrator

Author

Commented:
No. That I have not done. Actually wasn't aware of that. What is the process for that?
Thomas AnthonySecurity Administrator

Author

Commented:
It is upgrading now. Thanks so much for your help.
Scott SilvaNetwork Administrator

Commented:
Usually adding AD services to a server does the domain prep commands for you in newer versions, but it is possible for it to fail that step.
AlexA lack of information provides a lack of a decent solution.

Commented:
Excellent, you're very much welcome.

I'm actually quite surprised you didn't have any replication issues with 2012 DFL and FRS. It's not really supported from a microsoft perspective.

I'm pleased we got it sorted :-)

Regards

Alex

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