Server2019 can not be promoted to DC in an existing  Server2008 domain

Ohmit used Ask the Experts™
I'm managing a Windows domain with 2 server 2008 domain controllers. I need to add a new domain controller running Server 2019. However it is not possible to promote this because I need to raise domain functional level. The strange thing is, that Server2019 tells me, that I need to raise level to at least Server2008 which it is already??

This is the exact error message from the Server2019:

"Verification of replica failed. The forrest functional level is not supported. To install a Windows Server 2019 domain or domain controller, the forrest functional level must be Windows Server 2008 or higher"

Originally this WAS a Server2000 domain which was upgraded more than 10 years ago.
Watch Question

Do more with

Expert Office
EXPERT OFFICE® is a registered trademark of EXPERTS EXCHANGE®
Technical Manager
Top Expert 2010

Please execute the below command on domain controller in powershell to valid the forest functional level.
Get-ADForest | fl Name,ForestMode

Is it a single domain controller environment?
Distinguished Expert 2018

Forest and domain functional levels are not raised when you install new domain controllers. So you can have 2008 DCs and still be at a 2000 functional level.  You'll need to raise the functional levels to the minimum required level.


Thanks guys. Ill get back to you as soon as possible :-)

Do more with

Expert Office
Submit tech questions to Ask the Experts™ at any time to receive solutions, advice, and new ideas from leading industry professionals.

Start 7-Day Free Trial