How to fix “An attempt was made to modify an object to include an attribute that is not legal for its class. [ERROR_DS_ATT_NOT_DEF_FOR_CLASS (0x207D)]” – Error Code 8317

Overview

In this article, we’ll focus on resolving the issue described as: “An attempt was made to modify an object to include an attribute that is not legal for its class. [ERROR_DS_ATT_NOT_DEF_FOR_CLASS (0x207D)]”. This error, identified by the error code Error Code 8317, can impede your system’s performance, and here’s how you can fix it.

Identifying the Problem

Error Code 8317 arises when an attempt is made to add an attribute to an Active Directory object that is not supported by its class. This error commonly occurs during domain migrations when attributes not supported by the target domain controller’s schema are transferred from the source domain.

Common Fixes

1. Ensure Proper Schema:
* Verify that the attribute you’re attempting to add is supported by the class of the object.
* If not, use the Active Directory Schema Management Console (ADSM) to extend the schema on the target domain controller.

2. Check Object Permissions:
* Ensure that you have sufficient permissions to modify the object’s attributes.
* Use the Active Directory Users and Computers console to check the object’s permissions and grant yourself the necessary rights.

3. Remove Conflicting Extensions:
* Determine if there are any attribute extensions conflicting with the attribute you’re trying to add.
* Use the ADSM to remove any conflicting extensions from the object’s class.

4. Modify Attribute Definition:
* In some cases, modifying the attribute definition itself may resolve the issue.
* Use the ADSM to edit the attribute definition and ensure that it aligns with the class of the object.

Advanced Troubleshooting

1. Inspect LDAP Query:
* Use the LDAP Query Builder to inspect LDAP queries that cause the error to occur.
* Check if any attributes in the queries are not supported by the object’s class.

2. Check Domain Trust:
* Ensure that there is proper domain trust established between the source and target domains.
* Without proper trust, attribute replication can fail, leading to Error Code 8317.

3. Recreate the Object:
* As a last resort, you can try recreating the affected object and repopulating its attributes.
* Delete the object and recreate it with the supported attributes.

Conclusion

Error Code 8317 can be resolved by ensuring that the necessary attributes are supported by the object’s class, checking permissions, removing conflicting extensions, modifying attribute definitions, and inspecting LDAP queries. By following the provided fixes, you can effectively troubleshoot and resolve this issue. To prevent this error in the future, it’s essential to carefully consider attribute modifications, ensure proper schema alignment, and maintain a robust domain infrastructure.