How can I verify the SSL certificate on my origin server?

You can use online SSL checker tools like SSL Labs' SSL Server Test (https://www.ssllabs.com/ssltest/) to analyze your origin server's SSL certificate. This tool checks various aspects of the certificate, including its validity, chain of trust, and configuration. Also, using `openssl s_client -connect yourdomain.com:443` in your terminal can provide detailed information about the certificate and SSL/TLS handshake.