How To Fix LDAP_DELAYED_AUTH009 - User &1 found more than once in LDAP server &2 (1: "&3", 2: "&4")

SAP Error Message - Details

• Message type: E = Error

• Message class: LDAP_DELAYED_AUTH - LDAP Delayed Authentication

• Message number: 009

• Message text: User &1 found more than once in LDAP server &2 (1: "&3", 2: "&4")

What causes this issue?

The user of the SAP system for which the process of delayed
authentication against a directory service should be prepared exists
multiple times in the directory service, so that it is not determinable
for the SAP system for which of those users the authentication shall be
executed.

System Response

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

How to fix this error?

Procedure for System Administrators

Ensure that the filter attribute which is used to identify the SAP users
in the directory service is unique.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message LDAP_DELAYED_AUTH009 - User &1 found more than once in LDAP server &2 (1: "&3", 2: "&4") ?

  The SAP error message LDAP_DELAYED_AUTH009 indicates that there is a problem with duplicate user entries in the LDAP (Lightweight Directory Access Protocol) server. Specifically, it means that the user identified by &1 (the username) has been found more than once in the LDAP server identified by &2 (the LDAP server name). The additional parameters &3 and &4 provide further context, such as the distinguished names (DNs) of the duplicate entries.
  Cause
  The primary cause of this error is the presence of multiple entries for the same user in the LDAP directory. This can happen due to various reasons, including:
  
  Incorrect synchronization between the SAP system and the LDAP server.
  Manual entry errors where the same user is created multiple times.
  Issues with the LDAP schema or configuration that allow duplicate entries.
  
  Solution
  To resolve the LDAP_DELAYED_AUTH009 error, you can follow these steps:
  
  
  Identify Duplicate Entries:
  
  Use an LDAP browser or command-line tools to query the LDAP server for the user in question. Look for entries with the same username or unique identifier.
  Example LDAP query: ldapsearch -x -b "dc=example,dc=com" "(uid=username)" (replace with your actual base DN and username).
  
  
  
  Remove or Merge Duplicates:
  
  If you find multiple entries for the same user, determine which entry is valid and remove or merge the duplicates as necessary. Ensure that you have backups before making changes.
  If the duplicates are due to synchronization issues, you may need to adjust the synchronization settings or processes.
  
  
  
  Check LDAP Configuration:
  
  Review the LDAP server configuration to ensure that it is set up correctly to prevent duplicate entries. This may involve checking the schema, indexing, and any constraints that should be in place.
  
  
  
  Update SAP Configuration:
  
  After resolving the duplicates in LDAP, ensure that the SAP system is correctly configured to connect to the LDAP server. This includes checking the LDAP connection settings in the SAP system.
  
  
  
  Test the Connection:
  
  After making the necessary changes, test the connection from SAP to the LDAP server to ensure that the error no longer occurs.
  
  
  
  Related Information
  
  SAP Notes: Check SAP Notes related to LDAP integration and user authentication for any specific guidance or patches that may address this issue.
  LDAP Documentation: Refer to the documentation for your specific LDAP server (e.g., OpenLDAP, Microsoft Active Directory) for best practices on managing user entries and preventing duplicates.
  SAP Community: Engage with the SAP Community forums for additional insights and experiences from other users who may have encountered similar issues.
  
  By following these steps, you should be able to resolve the LDAP_DELAYED_AUTH009 error and ensure that your SAP system can authenticate users correctly against the LDAP server.