How to install an additional SSL certificate on the same site for IIS?

Question

IIS

On IIS 8 (Windows Server 2012) there is a site that responds to the test1.ru and www.test1.ru domains , an SSL certificate was purchased, installed, now the site works fine at https://test1.ru and https:// www.test1.ru (both of these domains are registered in the SSL certificate)

It is necessary that the same site also responds to the test1.com and www.test1.com domains with security support (i.e. that the same site responds to the addresses: https://test1.com and https://www.test1.com )

I understand that you need to buy a new SSL certificate for the test1.com and www.test1.com domains.
The question is how to install it? Digging through the settings, I did not find such an opportunity (I did not install the previous certificate either)

Answer 1

It turned out that everything is not difficult. But you need a second ip-address. Rule: one certificate per "endpoint" is not (ip-address-port binding), since ssl always works on port 443, a new address is needed. We order a new address from the provider, bandit a new domain to this address, buy a certificate, to a new domain, add a new certificate in the iis section for a certificate, give it a name, for example, the same as the domain. In site bindings, add lines for www and without www