How To Fix SCLNT_HTTP415 - Invalid host name in SSL server certificate (ICM_HTTP_SSL_CERT_MISMATCH)

SAP Error Message - Details

• Message type: E = Error

• Message class: SCLNT_HTTP - Messages for HTTP Client for Respective Error Code

• Message number: 415

• Message text: Invalid host name in SSL server certificate (ICM_HTTP_SSL_CERT_MISMATCH)

What causes this issue?

The host name that is specified in the certificate of the server does
not match the name that was used for setting up the network connection.

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?

Check that the fully qualified host name, with domain, was used for the
network connection. Where possible, use the host name specified in the
server certificate, or contact the administrator of the server to import
a certificate with a valid name.

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message SCLNT_HTTP415 - Invalid host name in SSL server certificate (ICM_HTTP_SSL_CERT_MISMATCH) ?

  The SAP error message SCLNT_HTTP415 with the description "Invalid host name in SSL server certificate (ICM_HTTP_SSL_CERT_MISMATCH)" typically occurs when there is a mismatch between the hostname used in the URL and the hostname specified in the SSL certificate presented by the server. This can happen in various scenarios, such as when accessing an SAP system over HTTPS.
  Cause:
  
  
  Hostname Mismatch: The hostname you are using to access the SAP system does not match the Common Name (CN) or Subject Alternative Name (SAN) in the SSL certificate. For example, if you are accessing https://sap.example.com, but the certificate is issued for https://example.com, this will trigger the error.
  
  
  Self-Signed Certificates: If you are using a self-signed certificate, it may not be trusted by the client, leading to this error.
  
  
  Expired or Invalid Certificate: The SSL certificate may have expired or may not be valid for the domain you are trying to access.
  
  
  DNS Issues: There may be DNS resolution issues where the hostname does not resolve correctly to the intended server.
  
  
  Solution:
  
  
  Check the Certificate: Verify the SSL certificate being used by the server. You can do this by accessing the server in a web browser and checking the certificate details. Ensure that the CN or SAN matches the hostname you are using.
  
  
  Update the Hostname: If the hostname in the URL does not match the certificate, update the URL to use the correct hostname that matches the certificate.
  
  
  Reissue the Certificate: If the certificate is incorrect, you may need to reissue it with the correct hostname. Ensure that the new certificate includes the correct CN or SAN.
  
  
  Use a Trusted Certificate Authority: If you are using a self-signed certificate, consider obtaining a certificate from a trusted Certificate Authority (CA) to avoid trust issues.
  
  
  Check DNS Settings: Ensure that the DNS settings are correct and that the hostname resolves to the correct IP address.
  
  
  Browser/Client Configuration: If you are accessing the SAP system through a browser or client, ensure that it is configured to trust the certificate being used.
  
  
  Related Information:
  
  SAP Notes: Check SAP Notes related to SSL configuration and certificate management for specific guidance and troubleshooting steps.
  SSL Configuration: Review the SSL configuration in the SAP system, including the ICM (Internet Communication Manager) settings.
  Logs: Check the SAP system logs (e.g., dev_icm) for more detailed error messages that can provide additional context for the issue.
  
  By following these steps, you should be able to resolve the SCLNT_HTTP415 error and ensure that your SAP system can communicate securely over HTTPS.