How To Fix 00773 - The received X.509 client certificate was not sent by ITS

SAP Error Message - Details

• Message type: E = Error

• Message class: 00 -

• Message number: 773

• Message text: The received X.509 client certificate was not sent by ITS

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.

What else can you do?

First, use our AnswerBot below to get a possible cause and solution (requires a premium subscription).

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.

You can also try searching the SAP support portal (support.sap.com) but you need a special user ID to access it. It is possible that an SAP support note exists that provides additional details about the mistake or even steps for fixing it.

Smart SAP Assistant

• What is the cause and solution for SAP error message 00773 - The received X.509 client certificate was not sent by ITS ?

  The SAP error message "00773 The received X.509 client certificate was not sent by ITS" typically occurs in scenarios where there is an issue with the handling of X.509 client certificates in the context of SAP Internet Transaction Server (ITS). This error indicates that the client certificate presented during the SSL handshake is not recognized as being sent by the ITS, which can lead to authentication failures.
  Causes:
  
  Misconfiguration of ITS: The ITS may not be properly configured to accept or validate the X.509 client certificates.
  Certificate Trust Issues: The certificate presented by the client may not be trusted by the ITS, possibly due to missing root or intermediate certificates in the trust store.
  Incorrect Certificate Chain: The client certificate may not be part of a valid certificate chain that leads back to a trusted root certificate.
  Client Certificate Not Sent: The client may not be sending the certificate at all, or it may be sending an incorrect or expired certificate.
  Network Issues: There may be network issues that prevent the proper transmission of the certificate.
  
  Solutions:
  
  
  Check ITS Configuration:
  
  Ensure that the ITS is configured to accept X.509 client certificates. This includes checking the SSL settings and ensuring that the correct authentication methods are enabled.
  Verify that the ITS is set up to trust the certificate authority (CA) that issued the client certificates.
  
  
  
  Update Trust Store:
  
  Make sure that the trust store used by the ITS contains the necessary root and intermediate certificates. You may need to import the CA certificates into the trust store.
  
  
  
  Validate Certificate Chain:
  
  Check the client certificate to ensure that it is valid and that the entire certificate chain is intact. You can use tools like OpenSSL to verify the certificate chain.
  
  
  
  Client Configuration:
  
  Ensure that the client is configured to send the correct X.509 certificate. This may involve checking the client application settings or browser settings if applicable.
  
  
  
  Network Troubleshooting:
  
  Investigate any potential network issues that may be affecting the transmission of the client certificate. This could include firewall settings or proxy configurations.
  
  
  
  Review Logs:
  
  Check the logs on both the client and the ITS side for any additional error messages or warnings that could provide more context about the issue.
  
  
  
  Related Information:
  
  SAP Notes: Check SAP Notes related to X.509 client certificates and ITS for any specific patches or updates that may address known issues.
  Documentation: Review the official SAP documentation on configuring SSL and X.509 certificates for detailed guidance on setup and troubleshooting.
  Community Forums: Engage with SAP community forums or support channels for insights from other users who may have encountered similar issues.
  
  By following these steps, you should be able to diagnose and resolve the error message related to X.509 client certificates in SAP ITS.