How To Fix 5G390 - No screen checks are possible if a non-standard certificate is used

SAP Error Message - Details

• Message type: E = Error

• Message class: 5G - HR: Messages for Britain

• Message number: 390

• Message text: No screen checks are possible if a non-standard certificate is used

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message 5G390 - No screen checks are possible if a non-standard certificate is used ?

  The SAP error message 5G390 indicates that the system is unable to perform screen checks because a non-standard certificate is being used. This typically occurs in the context of SAP's secure communication protocols, such as SSL/TLS, where certificates are used to establish secure connections.
  Cause:
  
  Non-Standard Certificate: The error arises when the system encounters a certificate that does not meet the expected standards or is not recognized as valid. This could be due to:
  
  The certificate being self-signed and not trusted by the SAP system.
  The certificate being issued by a Certificate Authority (CA) that is not included in the trusted root CA list of the SAP system.
  The certificate being expired or not yet valid.
  Incorrect configuration of the SSL settings in the SAP system.
  
  
  
  Solution:
  To resolve this error, you can take the following steps:
  
  
  Check the Certificate:
  
  Verify the validity of the certificate (check expiration dates, etc.).
  Ensure that the certificate is issued by a trusted CA.
  
  
  
  Import the Certificate:
  
  If the certificate is self-signed or from a non-standard CA, you may need to import it into the SAP system's trust store.
  Use transaction STRUST in the SAP GUI to manage SSL certificates.
  Import the certificate into the appropriate SSL server or client PSE (Personal Security Environment).
  
  
  
  Update the Trust Store:
  
  Ensure that the root CA certificate of the issuing CA is also imported into the trust store if applicable.
  
  
  
  Configuration Check:
  
  Review the SSL configuration settings in the SAP system to ensure they are correctly set up.
  Check the parameters related to SSL in the instance profile (e.g., icm/SSL/verify_client, icm/SSL/verify_server).
  
  
  
  Restart the SAP Instance:
  
  After making changes to the certificates or configuration, restart the relevant SAP instance to apply the changes.
  
  
  
  Related Information:
  
  Documentation: Refer to SAP's official documentation on SSL configuration and certificate management for detailed steps and best practices.
  SAP Notes: Check for any relevant SAP Notes that may address specific issues related to SSL and certificates.
  Security Policies: Ensure that your organization’s security policies regarding SSL/TLS and certificate management are being followed.
  
  If the issue persists after following these steps, consider reaching out to SAP support for further assistance, providing them with detailed information about the error and the steps you have already taken.