How To Fix SLDAP_ICM019 - Operation on "&1" causes a referral loop (call on level &2 same as on &3)

SAP Error Message - Details

• Message type: E = Error

• Message class: SLDAP_ICM - ICM LDAP Plugin: Messages

• Message number: 019

• Message text: Operation on "&1" causes a referral loop (call on level &2 same as on &3)

What causes this issue?

The ICM LDAP plug-in detected a referral or search result reference
loop, that is it is supposed to contact a directory service (identified
by hostname and port) with an LDAP request which has been send earlier
during processing the same request from the ABAP LDAP API.

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

The reason for this error is in the directory service and the referenced
services and can only be fixed there.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message SLDAP_ICM019 - Operation on "&1" causes a referral loop (call on level &2 same as on &3) ?

  The SAP error message SLDAP_ICM019 indicates that there is a referral loop occurring in the context of an LDAP (Lightweight Directory Access Protocol) operation. This typically happens when the LDAP server is configured in such a way that it causes a recursive call, where the same operation is being called repeatedly without reaching a resolution.
  Cause:
  
  Referral Loop: The error suggests that the LDAP server is configured to refer to itself or to another server that eventually refers back to the original server, creating a loop.
  Misconfiguration: This can occur due to incorrect settings in the LDAP server configuration, such as referral settings or base DN (Distinguished Name) settings.
  Network Issues: Sometimes, network misconfigurations can lead to unexpected behavior in LDAP queries, causing loops.
  
  Solution:
  
  
  Check LDAP Configuration:
  
  Review the LDAP server configuration for any referral settings that may be causing the loop. Ensure that the referrals are correctly set up and do not point back to the same server or to a server that points back to the original.
  Verify the base DN settings to ensure they are correctly defined and do not overlap in a way that could cause recursion.
  
  
  
  Adjust Referral Handling:
  
  If your LDAP server is set to follow referrals, consider adjusting this setting. You may want to disable referral chasing or configure it to handle referrals differently.
  
  
  
  Test LDAP Queries:
  
  Use LDAP query tools (like ldapsearch) to test the queries being made to the server. This can help identify if the queries are being redirected inappropriately.
  
  
  
  Review Logs:
  
  Check the logs of the LDAP server for any additional error messages or warnings that could provide more context about the loop.
  
  
  
  Consult Documentation:
  
  Refer to the documentation for your specific LDAP server (e.g., OpenLDAP, Microsoft Active Directory) for guidance on configuring referrals and troubleshooting loops.
  
  
  
  SAP Notes:
  
  Check the SAP Support Portal for any relevant SAP Notes that may address this specific error or provide additional troubleshooting steps.
  
  
  
  Related Information:
  
  LDAP Basics: Understanding how LDAP works, including its structure (entries, attributes, DNs) and how referrals are handled, can be beneficial in troubleshooting.
  SAP Integration: If SAP is integrated with an LDAP directory for user authentication or other purposes, ensure that the integration settings are correctly configured.
  Network Configuration: Ensure that there are no network issues that could be causing the LDAP server to behave unexpectedly.
  
  By following these steps, you should be able to identify and resolve the cause of the SLDAP_ICM019 error in your SAP environment.