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ERROR_DS_BACKLINK_WITHOUT_LINK
A computed back link cannot exist independently
ERROR_DS_BACKLINK_WITHOUT_LINK indicates that the schema update defines the odd-numbered side of a linked-attribute pair without a valid even-numbered forward link. Active Directory stores values only on the forward attribute; it computes the back-link values by finding objects whose forward link contains the target object’s distinguished name.
Create and replicate the forward-link attributeSchema first, then define the back link with linkID = forwardLinkID + 1. Verify that the forward syntax can carry a distinguished name and that the back link uses Object(DS-DN). Do not populate the back link directly or declare it single-valued. When deploying through multiple LDIF files, preserve ordering and wait for schema replication before importing the dependent definition on another domain controller.
Pairing requirements
- Forward attribute name and even linkID.
- Back-link name and adjacent odd linkID.
- Forward and back-link attribute syntaxes.
- Import order and schema replication status.
References
- Microsoft: forward-link and back-link requirements
- Microsoft: Active Directory attribute syntaxes
- MS-ADTS: back links are constructed attributes
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