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What is the role of IP address behind an SSL Certificate?

By Alice Freriksen ·
This is a frequently asked question by the most of webmaster on internet, so here I am trying to help them from this community.

In this discussing we are trying to understand the role of IP address behind SSL certificate with simple question and answer

Question: I have two domains called abc.com and xyz.com. Both are hosted on same IP address like 1xx.xx.xx.xxx

I have purchased SSL for abc.com and its work fine but when we request https:// xyz.com then we found domain mismatch error.

Why this happens? Will it harm my websites?

Answer. First, be clear that SSL works for a particular domain so when you purchased SSL for abc.com and then you request for xyz.com with HTTPS protocol it will show a name mismatch error. Now why this happened? Because when a browser try to connect with the server for its first handshake, the browser will check itself the protocol and web address that you typed (www.xyz.com) to confirm the domain name on which SSL is given. Now here a problem arises because the common name (domain name) in the SSL certificate does not match the address typed in the address bar. Therefore, the browser will show a domain name mismatch error and thus the connection could not be established. That is why SSL secures a single domain to make easy for the handshake between the browser and the server.

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