How To Fix SPN026 - Kerberos token verify error:

SAP Error Message - Details

• Message type: E = Error

• Message class: SPN - SPnego

• Message number: 026

• Message text: Kerberos token verify error:

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.

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Smart SAP Assistant

• What is the cause and solution for SAP error message SPN026 - Kerberos token verify error: ?

  The SAP error message SPN026, which indicates a "Kerberos token verify error," typically arises in environments where SAP systems are configured to use Kerberos authentication for Single Sign-On (SSO). This error can occur due to various reasons related to Kerberos configuration, service principal names (SPNs), or issues with the Key Distribution Center (KDC).
  Causes of SPN026 Error
  
  
  Incorrect SPN Configuration: The Service Principal Name (SPN) for the SAP service may not be correctly registered in the Active Directory (AD). Each service that uses Kerberos authentication must have a unique SPN.
  
  
  Kerberos Ticket Issues: The Kerberos ticket may be expired, invalid, or not properly issued for the user or service account.
  
  
  Clock Skew: Kerberos is sensitive to time differences between the client and server. If the system clocks are not synchronized, authentication may fail.
  
  
  DNS Issues: Kerberos relies heavily on DNS. If there are issues with DNS resolution, it can lead to authentication failures.
  
  
  Service Account Permissions: The service account used for the SAP system may not have the necessary permissions in Active Directory.
  
  
  KDC Configuration: Issues with the Key Distribution Center (KDC) configuration can also lead to authentication failures.
  
  
  Solutions to SPN026 Error
  
  
  Check SPN Registration:
  
  Ensure that the SPN is correctly registered for the SAP service account in Active Directory. You can use the setspn command to check and register SPNs.
  Example command to check SPNs:
  setspn -L <service_account>
  
  Example command to add an SPN:
  setspn -A <SPN> <service_account>
  
  
  
  
  Verify Kerberos Tickets:
  
  Use the klist command to check the Kerberos tickets on the client machine. Ensure that the ticket is valid and not expired.
  If necessary, clear the Kerberos ticket cache using:
  kdestroy
  
  
  
  
  Synchronize Clocks:
  
  Ensure that the system clocks on the client and server are synchronized. You can use NTP (Network Time Protocol) to keep the clocks in sync.
  
  
  
  Check DNS Configuration:
  
  Verify that DNS is correctly configured and that the SAP server can resolve the client’s hostname and vice versa.
  
  
  
  Review Service Account Permissions:
  
  Ensure that the service account has the necessary permissions in Active Directory and is not locked or disabled.
  
  
  
  KDC Configuration:
  
  Check the configuration of the KDC to ensure it is functioning correctly and that there are no issues with the Kerberos realm.
  
  
  
  Related Information
  
  SAP Notes: Check SAP Notes related to Kerberos authentication and SPN issues. SAP frequently updates its knowledge base with solutions to common problems.
  Documentation: Review the official SAP documentation on configuring Kerberos authentication for detailed steps and best practices.
  Logs: Check the SAP system logs (transaction SM21) and the Windows Event Viewer for additional error messages that may provide more context on the issue.
  
  By following these steps, you should be able to diagnose and resolve the SPN026 Kerberos token verify error in your SAP environment.