How To Fix MPE_OAN055 - Specify a certificate

SAP Error Message - Details

• Message type: E = Error

• Message class: MPE_OAN - Operation Activity Network Messages

• Message number: 055

• Message text: Specify a certificate

Self-Explanatory Message

Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of messages in the SAP system have a message text, however this is frequently insufficient to comprehend or resolve the problem.

To make things easier, more detailed information is frequently added to describe the issue, how to fix it, and the necessary steps or configuration modifications.

Unfortunately, there isn't any extra information in this error notice.

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Smart SAP Assistant

• What is the cause and solution for SAP error message MPE_OAN055 - Specify a certificate ?

  The SAP error message MPE_OAN055, which states "Specify a certificate," typically occurs in the context of using secure communication protocols, such as SSL/TLS, where a digital certificate is required for authentication and encryption.
  Cause:
  
  Missing Certificate: The most common cause of this error is that the system is configured to use a secure connection, but no valid certificate has been specified in the configuration.
  Incorrect Configuration: The system may be incorrectly configured to point to a certificate that does not exist or is not accessible.
  Expired Certificate: If a certificate is specified but has expired, the system may not recognize it as valid.
  User Permissions: The user or service account may not have the necessary permissions to access the certificate store or the specified certificate.
  
  Solution:
  
  
  Specify a Valid Certificate:
  
  Go to the relevant configuration settings in SAP where the certificate is required (e.g., in transaction codes like STRUST or STRUSTSSO2).
  Ensure that a valid SSL certificate is uploaded and configured correctly.
  
  
  
  Check Certificate Path:
  
  Verify that the path to the certificate is correct and that the certificate file is accessible by the SAP system.
  
  
  
  Renew or Replace Expired Certificates:
  
  If the certificate is expired, obtain a new certificate from a trusted Certificate Authority (CA) and upload it to the SAP system.
  
  
  
  User Permissions:
  
  Ensure that the user or service account running the SAP application has the necessary permissions to access the certificate.
  
  
  
  Check SSL Configuration:
  
  Review the SSL configuration settings in the SAP system to ensure they are set up correctly. This includes checking the SSL client settings and ensuring that the correct SSL provider is being used.
  
  
  
  Restart Services:
  
  After making changes to the certificate or configuration, restart the relevant SAP services to ensure that the changes take effect.
  
  
  
  Related Information:
  
  
  Transaction Codes: 
  
  STRUST: Used for managing SSL certificates in SAP.
  STRUSTSSO2: Used for managing Single Sign-On (SSO) certificates.
  
  
  
  Documentation: Refer to SAP Help documentation for detailed steps on managing certificates and SSL configurations.
  
  
  Logs: Check the SAP system logs (transaction SM21) and the application logs (transaction SLG1) for additional error messages that may provide more context about the issue.
  
  
  SAP Notes: Search for relevant SAP Notes in the SAP Support Portal that may address specific issues related to SSL certificates and the MPE_OAN055 error.
  
  
  If the issue persists after following these steps, consider reaching out to SAP support for further assistance.