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ERROR_DS_DOMAIN_VERSION_TOO_HIGH
The server cannot host the domain at its current functional level
A domain functional level must be supportable by every domain controller that hosts the domain naming context. The candidate DC exposes a maximum behavior version; promotion is blocked when the domain requests a higher level than that server implementation can provide.
Check the domain mode independently from the forest mode because the two values are related but not identical. A domain can be at a higher functional level than the forest in supported configurations, so diagnosing only the forest value can miss the mismatch. The normal solution is to upgrade the candidate server or use a supported DC version, not to manually alter functional-level metadata.
What to inspect
- Read DomainMode for the exact target domain.
- Compare the candidate DC version with the behavior levels documented for that Windows Server release.
- Verify no automation selected a different target domain than expected during promotion.
References
- Microsoft: AD DS functional levels
- MS-ADTS: DC functional level
- Microsoft: raise domain and forest functional levels
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