Hypertext Transfer Protocol Secure (HTTPS) is a communications protocol for secure communication over a computer network, with especially wide deployment on the Internet. Technically, it is not a protocol in and of itself; rather, it is the result of simply layering the Hypertext Transfer Protocol (HTTP) on top of the SSL/TLS protocol, thus adding the security capabilities of SSL/TLS to standard HTTP communications.
You can find a web tool to check the current accessibility of sites/pages using the encrypted HTTPS protocol at http://www.downforeveryone.com/https-check/, which is nicely designed, simple and it’s very intuitive for it’s users. The website works well on any resolution and in all major web browsers. So, I really encourage you to check them out.