What does Windows error code 8416 (ERROR_DS_ATT_SCHEMA_REQ_SYNTAX) mean?

 
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ERROR_DS_SCHEMA_ALLOC_FAILED ERROR_DS_GCVERIFY_ERROR

ERROR_DS_ATT_SCHEMA_REQ_SYNTAX

The attribute definition has no usable value syntax

ERROR_DS_ATT_SCHEMA_REQ_SYNTAX is raised while AD DS needs the syntax information for an attributeSchema object and cannot obtain it. The attribute's syntax is fundamental: it controls how LDAP values are represented and which operations and matching rules can be applied safely.

In Active Directory, the syntax is specified through attributeSyntax and oMSyntax; some cases also use oMObjectClass. An empty field, an unsupported combination, or an import that does not match the server's supported syntax set cannot be fixed by changing the value sent to a normal directory object.

Checks before another schema import

  • Read the exact attributeSchema object and capture attributeID, lDAPDisplayName, attributeSyntax, oMSyntax, and oMObjectClass where applicable.
  • Compare the syntax tuple with the AD DS syntax table rather than guessing from the visible string representation of a value.
  • Validate the LDIF in an isolated forest first; production schema changes are globally replicated and additions are not reversible.
  • Check whether a dependent class definition or application has been deployed ahead of the attribute definition.

Not a client-side conversion error

A client may also fail to encode a value for an otherwise valid attribute, but that is different. This status points to the schema metadata the directory needs to understand the attribute itself.

References

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