How do I resolve mixed content errors on a subdomain after enabling Cloudflare SSL?

Mixed content errors occur when an HTTPS page tries to load resources (images, scripts, CSS) over insecure HTTP connections, causing browser warnings. To resolve this: 1. **Enable Automatic HTTPS Rewrites:** In your Cloudflare dashboard, go to 'SSL/TLS' -> 'Edge Certificates' and ensure 'Automatic HTTPS Rewrites' is enabled. This feature attempts to automatically rewrite 'http://' links to 'https://' for resources. 2. **Manually Update URLs:** If automatic rewrites miss some, inspect your subdomain's source code (HTML, CSS, JavaScript) and manually change any hardcoded 'http://' URLs to 'https://'. For CMS platforms, check theme files, plugin settings, and the database. 3. **Check External Resources:** Ensure all third-party scripts, widgets, or embedded content are also served over HTTPS. 4. **Use Relative URLs:** Employ relative URLs (e.g., `/images/logo.png`) where possible, as they adapt to the current protocol. 5. **Browser Developer Tools:** Use your browser's developer console (Console tab) to identify specific mixed content warnings and locate the problematic resources.