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ERROR_DS_DOMAIN_VERSION_TOO_LOW
The domain behavior level is below the minimum supported by this server
Newer Windows Server releases can require a minimum AD DS domain functional level for promotion. This status is different from a low-version existing DC blocking a requested raise: here the domain itself is still operating at a behavior level the candidate directory-service build no longer supports.
Check the target domain mode and inventory every DC that hosts that domain. Raise the domain level only after older or incompatible domain controllers have been removed or upgraded and replication is healthy. The forest level also constrains supported domain-level relationships, so use the documented administration path rather than directly modifying msDS-Behavior-Version.
What to inspect
- Read DomainMode and the OS version of every DC in the target domain.
- Upgrade or demote incompatible DCs before changing the domain level.
- Raise the level with AD DS administration tools and verify replication afterward.
References
- Microsoft: AD DS functional levels
- Microsoft: raise domain and forest functional levels
- MS-ADTS: behavior-version updates
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