Once an SSL certificate has been installed on a website, you can access that website by typing https:// at the beginning of the address rather than just http://. If everything is setup correctly, then you web browser will display a padlock to indicate that the website is secure or even a green address bar if you have an EV certificate.
If something is wrong with the certificate, then you web browser will most likely display a very prominent error message or may even prevent you from loading the page at all.
However, if the page loads without any errors but doesn't display a padlock when using https:// then you likely have a mixed content problem. This means that whilst the main page itself is loading securely, there are parts of the page which are still loading insecurely and so the whole page cannot be considered fully secure.
How to fix a mixed content error?
Finding mixed content quickly
Most web browsers have some form of developer tools which allow you to view the page source, network requests and responses as well as any errors that the page generates. This error console would also display messages about any content that cannot be loaded due to being insecure.
In Firefox go to Tools > Web Developer > Network to display a list of page resources and where they were loaded from, insecure resources won't show a green source.
In Chrome go to View > Developer > Developer Tools and then click on the Security tab to display a quick summary of the page security.
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