How To Fix 00178 - Logon refused (license key invalid)

SAP Error Message - Details

• Message type: E = Error

• Message class: 00 -

• Message number: 178

• Message text: Logon refused (license key invalid)

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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Also, review the in-depth Common Questions & Answers listed below; you could discover a solution there or be able to connect with others who have faced similar challenges.

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Smart SAP Assistant

• What is the cause and solution for SAP error message 00178 - Logon refused (license key invalid) ?

  The SAP error message "00178 Logon refused (license key invalid)" indicates that the system is unable to validate the license key for the SAP installation. This can occur for several reasons, and here are the common causes, solutions, and related information:
  Causes:
  
  Expired License Key: The license key may have expired, which means the system can no longer accept logins.
  Incorrect License Key: The license key entered during installation or configuration may be incorrect or not matching the system's configuration.
  System Change: Changes in the system configuration (like hardware changes) can lead to an invalidation of the existing license key.
  License Key Not Installed: The license key may not have been installed properly or at all.
  Multiple Instances: If there are multiple instances of SAP running on the same server, there may be conflicts with the license keys.
  
  Solutions:
  
  Check License Key: Verify that the license key is correct and corresponds to the current system configuration. You can check this in the SAP system under the transaction code SLICENSE.
  Renew License: If the license key has expired, contact SAP or your SAP account representative to obtain a new license key.
  Reinstall License Key: If the license key is not installed or was installed incorrectly, you can reinstall it using the transaction code SLICENSE. Make sure to follow the correct procedure for entering the license key.
  Check System Configuration: Ensure that there have been no unauthorized changes to the system that could affect the license key validation.
  Review SAP Notes: Check the SAP Support Portal for any relevant SAP Notes that may address specific issues related to license keys and logon problems.
  Contact SAP Support: If the issue persists after trying the above solutions, it may be necessary to contact SAP Support for further assistance.
  
  Related Information:
  
  
  Transaction Codes: 
  
  SLICENSE: To manage and view license keys.
  SLICENSE can also be used to check the status of the license and see if it is valid or expired.
  
  
  
  Documentation: Refer to the official SAP documentation for detailed instructions on managing licenses and troubleshooting license-related issues.
  
  
  SAP Community: Engage with the SAP Community forums for insights from other users who may have experienced similar issues.
  
  
  By following these steps, you should be able to resolve the "Logon refused (license key invalid)" error in your SAP system.