Mixed Content is when your site is serving some of the page's content over HTTP, and some over HTTPS. This is a problem because if any piece of content is serv

Mixed Content is when your site is serving some of the page's content over HTTP, and some over HTTPS. This is a problem because if any piece of content is served over HTTP, browsers will count the connection as non-secure and will not display the "green padlock". This is a pretty common problem when it comes to HTTPS deployment. Normally seen with sites that were deployed/designed without any consideration for HTTPS. Hardcoded URLs, third-party services that don't offer HTTPS, absolute protocol links, and big clunky infrastructure are the most common causes. Qualy's SSL Labs does not address this. It looks at the site's SSL configuration, not the way content is served. SSL Labs helps you know if there are any issues with your certificate (old signature algorithm, common name mismatch, self-signed, certificate chain issues, etc) and crypto settings (ciphers, protocol version, etc).