How To Fix SO771 - Logon to LDAP service failed

SAP Error Message - Details

• Message type: E = Error

• Message class: SO - SAPoffice: message texts

• Message number: 771

• Message text: Logon to LDAP service failed

What causes this issue?

The user ID stated (X.500 name and password) is not accepted by the
LDAP directory service.

System Response

How to fix this error?

Check the user ID.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message SO771 - Logon to LDAP service failed ?

  The SAP error message SO771, which indicates "Logon to LDAP service failed," typically arises when there are issues with the connection between the SAP system and the LDAP (Lightweight Directory Access Protocol) server. This can occur due to various reasons, including configuration errors, network issues, or authentication problems.
  Causes of SO771 Error
  
  
  Incorrect LDAP Configuration: The LDAP server settings in the SAP system may be incorrect. This includes the server address, port number, or base DN (Distinguished Name).
  
  
  Network Issues: There may be network connectivity problems preventing the SAP system from reaching the LDAP server.
  
  
  Authentication Issues: The credentials used to connect to the LDAP server may be incorrect or the user may not have the necessary permissions.
  
  
  LDAP Server Down: The LDAP server itself may be down or experiencing issues.
  
  
  Firewall Restrictions: Firewalls or security groups may be blocking the connection to the LDAP server.
  
  
  SSL/TLS Issues: If the connection to the LDAP server is secured using SSL/TLS, there may be issues with the certificates or the configuration of the secure connection.
  
  
  Solutions to SO771 Error
  
  
  Check LDAP Configuration:
  
  Verify the LDAP server settings in the SAP system (transaction code SO20).
  Ensure that the server address, port, and base DN are correctly configured.
  
  
  
  Test Network Connectivity:
  
  Use tools like ping or telnet to check if the SAP system can reach the LDAP server on the specified port.
  Ensure that there are no network issues or outages.
  
  
  
  Verify Credentials:
  
  Check the username and password used for the LDAP connection.
  Ensure that the user has the necessary permissions to access the LDAP server.
  
  
  
  Check LDAP Server Status:
  
  Confirm that the LDAP server is up and running.
  Check the server logs for any errors or issues.
  
  
  
  Review Firewall Settings:
  
  Ensure that any firewalls or security groups allow traffic between the SAP system and the LDAP server.
  
  
  
  SSL/TLS Configuration:
  
  If using SSL/TLS, verify that the certificates are valid and correctly configured.
  Check the SSL settings in the SAP system and ensure they match the LDAP server's requirements.
  
  
  
  SAP Notes and Documentation:
  
  Check for any relevant SAP Notes that may address this specific error or provide additional troubleshooting steps.
  
  
  
  Related Information
  
  
  Transaction Codes: 
  
  SO20: To configure LDAP settings.
  SICF: To check and configure HTTP services if LDAP is accessed over HTTP.
  
  
  
  Logs: 
  
  Check the SAP system logs (transaction SM21) and the developer traces (transaction ST22) for additional error messages that may provide more context.
  
  
  
  SAP Support: If the issue persists after checking the above points, consider reaching out to SAP support for further assistance.
  
  
  By following these steps, you should be able to diagnose and resolve the SO771 error in your SAP system.