What are the common troubleshooting steps for a 'Full SSL not working' error?

First, ensure your origin server is configured to redirect all HTTP traffic to HTTPS. Next, verify your Cloudflare SSL/TLS settings are correct – 'Full SSL' should be enabled, and 'OCSP Stapling' and 'Minimum TLS Version' should be appropriately configured. Clear your browser cache and cookies, and try a different browser to rule out browser-specific issues. Finally, check your origin server's SSL certificate for validity and proper configuration.