SSL tools Why no padlock
Certificate is valid, but the padlock still doesn't show up? The most common cause is an image, script or stylesheet still loading over HTTP.
When a site is on HTTPS but even one resource on the page (an image, a script, a stylesheet) still comes over HTTP, the browser calls this mixed content and hides the padlock or shows a warning. This tool loads the page and lists exactly which resources do this — with the line number in the source code, so you can find and fix it faster.
Also check the certificate installation itself with the SSL checker.