Don't let an expired SSL certificate stop your site's traffic
SSL (Secure Socket Layers) certificates tell your site’s visitors that you are whom you say you are and creates an encrypted connection between your domain (anexampledomain.com) and the visitor. If your domain doesn’t supply a valid certificate, the browser throws up a wall that warns the user that the site isn’t trusted. Many things may happen that tell the browser to issue the warning, but the most common reason is due to an expired SSL certificate.