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Sophos AD Sync error

Just recently I've encountered the following error:

Error making a request over LDAP. Please review the connection settings you specified. The LDAP server returned the following error: 0000208D: NameErr: DSID-03100238, problem 2001 (NO_OBJECT), data 0, best match of: 

Followed by a OU path that that really shouldn't be a issue, there has been no changes in the sync configuration. This is on-premise with Sophos AD Sync Utility v3.3.40.0.
Before the issue, the sync worked as expected. Has anyone been met with the same error?

Any help is greatly appreciated.



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  • Hello  

    Please check if the OU referenced still exists in your AD. You will need to review any filters you have set up under the AD Filters tab and Define Filters button. Remove any filters referencing objects removed from your Active Directory. More information on the AD sync and possible issues here. Here is a related Community post that may also help.

  • The OU that the error indicated, has now been changed to nested OUs that does have users within.

    So, the OUs with Region1-4 is now defined instead of the department OU. However, the previous error still persists. Even though it's not even defined.
    Department OU (with error that was removed from define)
            Region1 OU
            Region2 OU
            Region3 OU
            Region4 OU

    Only thing I can imagine is that there something cached and the new define rules aren't refreshed or updated. Any solutions?

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  • The OU that the error indicated, has now been changed to nested OUs that does have users within.

    So, the OUs with Region1-4 is now defined instead of the department OU. However, the previous error still persists. Even though it's not even defined.
    Department OU (with error that was removed from define)
            Region1 OU
            Region2 OU
            Region3 OU
            Region4 OU

    Only thing I can imagine is that there something cached and the new define rules aren't refreshed or updated. Any solutions?

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