How To Fix SIG155 - Internal error while checking password

SAP Error Message - Details

• Message type: E = Error

• Message class: SIG - Digital Signature

• Message number: 155

• Message text: Internal error while checking password

What causes this issue?

Due to an internal error, the system cannot check the password you have
entered.

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?

Enter the password again.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message SIG155 - Internal error while checking password ?

  The SAP error message SIG155, which indicates an "Internal error while checking password," typically arises during user authentication processes. This error can occur for various reasons, and understanding the cause is essential for troubleshooting. Here are some common causes, potential solutions, and related information:
  Causes:
  
  Database Issues: There may be problems with the database that stores user credentials, such as corruption or connectivity issues.
  User Master Record Issues: The user master record may be incomplete or corrupted, leading to authentication failures.
  Profile Parameters: Incorrect or missing profile parameters related to user authentication can trigger this error.
  SAP Kernel Issues: Bugs or inconsistencies in the SAP kernel version being used can lead to internal errors.
  Authorization Issues: The user may not have the necessary authorizations to perform the action they are attempting.
  Network Issues: Connectivity problems between the SAP application server and the database can also lead to this error.
  
  Solutions:
  
  
  Check User Master Record:
  
  Use transaction code SU01 to check the user master record for any inconsistencies or missing information.
  Ensure that the user is not locked or has expired credentials.
  
  
  
  Review System Logs:
  
  Check the system logs (transaction SM21) for any related error messages that could provide more context about the issue.
  
  
  
  Database Health Check:
  
  Perform a health check on the database to ensure it is functioning correctly. Look for any signs of corruption or connectivity issues.
  
  
  
  Profile Parameters:
  
  Review the profile parameters related to user authentication (e.g., login/password_expiration_time, login/fails_to_session_end) to ensure they are set correctly.
  
  
  
  Kernel Update:
  
  If the issue is suspected to be related to the SAP kernel, consider updating to the latest version or applying relevant patches.
  
  
  
  Authorization Check:
  
  Ensure that the user has the necessary authorizations to log in and perform the required actions.
  
  
  
  Contact SAP Support:
  
  If the issue persists after trying the above solutions, consider reaching out to SAP support for further assistance. Provide them with detailed logs and error messages for better diagnosis.
  
  
  
  Related Information:
  
  Transaction Codes:
  
  SU01: User Maintenance
  SM21: System Log
  SU53: Authorization Check
  
  
  SAP Notes: Check the SAP Support Portal for any relevant SAP Notes that may address this specific error or provide patches.
  Documentation: Review SAP documentation related to user management and authentication for best practices and troubleshooting steps.
  
  By following these steps, you should be able to identify and resolve the SIG155 error effectively.