The "SSL Handshake Failed Error Code 525" occurs when a secure connection between the web server and Cloudflare cannot be established. This usually means that the SSL/TLS handshake process has failed due to issues like misconfigured SSL certificates, incompatible encryption settings, or the origin server not supporting HTTPS. To fix it, ensure the origin server has a valid SSL certificate, supports SNI (Server Name Indication), and matches the SSL mode set in Cloudflare. This error can prevent users from accessing your site securely, so quick resolution is important to maintain trust and uptime.