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ERROR_DS_NO_BEHAVIOR_VERSION_IN_MIXEDDOMAIN
A legacy mixed-mode domain blocks the requested forest behavior change
Older Active Directory behavior models distinguished mixed and native domain operation. A forest-level raise that depends on native directory behavior cannot proceed while one or more domains still report mixed-mode semantics. This check is about domain behavior across the forest, not simply the operating system version of the server where the command was run.
Enumerate every domain in the forest and inspect its domain mode before retrying the forest-level operation. Resolve legacy domain-controller dependencies and move domains through the supported domain-level transition first. Do not modify ntMixedDomain or behavior attributes directly: functional-level changes coordinate multiple directory rules and compatibility checks that raw LDAP editing bypasses.
What to inspect
- List the functional mode of every domain in the forest.
- Remove remaining legacy DC dependencies before changing domain behavior.
- Raise domain behavior through supported tools before retrying the forest change.
References
- Microsoft: AD DS functional levels
- Microsoft: raise domain and forest functional levels
- MS-ADTS: behavior-version updates
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