Why is my secure site not displaying the "padlock" icon in the browser's status bar?
The padlock icon might not display in your browser's status bar, or you might receive errors that your site contains both secure and non-secure items, if all the elements in the page don't use HTTPS. These problems occur when any site element — an image, for example — loads from outside the secure (HTTPS) layer.
To resolve these problems, make sure that all images and other site elements are pulled from a secured location within your secure site. In other words, all images, and other URLs must start with HTTPS and not HTTP. Also, avoid embedding third-party objects in your site. If you must embed something from another website, make sure it is from a secure site.