Information

Error Message: "SSL certificate verification failure (Verify return code: 21)"

Cause: The error is due to an incomplete SSL certificate chain on the server, which prevents secure connections from being established.

Resolution Steps:

1. Identify the Issue:
   • The error occurs when attempting to push content to your WordPress CMS.
   • Verify the error message: "SSL certificate verification failure (Verify return code: 21)".
2. Install Complete SSL Certificate Chain:
   • Ensure the server presents a complete SSL certificate chain.
   • Include the intermediate certificate from IdenTrust (TrustID Server CA O1).
3. Update Server Configuration:
   • Update the server configuration to present the full certificate chain.
   • Use the following command to verify the installation:

   openssl s_client -connect your_instance.domain.com:443 -servername your_instance.domain.com

   • Ensure the command returns "Verify return code: 0 (ok)".
4. Verify Resolution:
   • Test the push to CMS functionality to confirm the issue is resolved.
   • Ensure content can be successfully published to the WordPress platform.

Note: If the issue persists after updating the SSL certificate chain, contact support for further assistance.