Ohmit

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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. &nbsp;You'll need to raise the functional levels to the minimum required level.
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IT/EE Solution Guide

Iamthecreator OM

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

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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??<br />
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This is the exact error message from the Server2019:<br />
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&quot;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&quot;<br />
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BONUS INFO:<br />
Originally this WAS a Server2000 domain which was upgraded more than 10 years ago.
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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"

BONUS INFO:
Originally this WAS a Server2000 domain which was upgraded more than 10 years ago.

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

Windows Server 2019

Windows Server 2008 and Windows Server 2008 R2, based on the Microsoft Vista codebase, is the last 32-bit server operating system released by Microsoft. It has a number of versions, including including Foundation, Standard, Enterprise, Datacenter, Web, HPC Server, Itanium and Storage; new features included server core installation and Hyper-V.

Windows Server 2008

Active Directory (AD) is a Microsoft brand for identity-related capabilities. In the on-premises world, Windows Server AD provides a set of identity capabilities and services, and is hugely popular (88% of Fortune 1000 and 95% of enterprises use AD). This topic includes all things Active Directory including DNS, Group Policy, DFS, troubleshooting, ADFS, and all other topics under the Microsoft AD and identity umbrella.