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ERROR_DS_INSTALL_NO_SRC_SCH_VERSION
The candidate DC could not determine the schema version of its source forest
AD DS deployment uses the objectVersion value on the Schema container as part of schema readiness checks. The deployment prerequisite logic discovers the Schema naming context and validates that its version is the expected value or determines that forest preparation is required. If the source value cannot be read, promotion cannot safely decide how to proceed.
Query the Schema container on the source DC with the same credentials and network path used by promotion. Distinguish a missing attribute from an LDAP access, authentication, or replication problem. Then compare the value with the Schema Master and another healthy DC. Do not create the attribute or copy a version number manually; a legitimate version must correspond to the schema definitions installed in the forest.
What to inspect
- Read Schema NC objectVersion directly on the selected source DC.
- Check permissions and LDAP connectivity using the promotion credentials.
- Compare schema version and replication state with the Schema Master.
References
- Microsoft: AD DS deployment and prerequisite checks
- Microsoft: find the Active Directory schema version
- Microsoft: troubleshoot AD schema mismatch
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