HostSEO Blog

Stories and News from IT Industry, Reviews & Tips | Technology Blog

IIS: multiple certificates installation

NOTE: Server Name Indication (SNI) protocol extension is supported starting from IIS 8.0 version so instructions below are not applicable for older versions of IIS. Legacy servers can use only one SSL certificate per IP address. If you have separate certificates for each of your websites, it will be necessary to assign a dedicated IP for each site. The alternative way is using a multi-domain (also known as SAN) certificate that cover required hostnames.

During certificate installation steps make sure that you tick Require Server Name Indication as shown on the screenshot:


Server Name Indication (SNI) is a specific SSL/TLS extension that allows using multiple SSL certificates on a single IP address. You can read more about it in this article.

Generally, the best practice for IIS servers is to have *one* SSL certificate that can be considered as the default certificate on the server. All websites that use that default SSL should have the Require Server Name Indication box unchecked.

All additional certificates must be used along with SNI enabled; otherwise, this may cause errors in IIS and disrupt the work of your websites.

Subscribe Now

10,000 successful online businessmen like to have our content directly delivered to their inbox. Subscribe to our newsletter!

Archive Calendar


Born in 2004 ... Trusted By Clients n' Experts

SEO Stars

They never made me feel silly for asking questions. Help me understand how to attract more people and improve my search engine ranking.

Read More

Emily Schneller Manager at Sabre Inc
SEO Stars

Took advantage of Hostseo's superb tech support and I must say, it is a very perfect one. It is very fast, servers reliability is incredible.

Read More

Leena Mäkinen Creative producer
SEO Stars

We're operating a worldwide network of servers with high quality standards requirements, we’ve choose hostseo to be our perfect partner.

Read More

Ziff Davis CEO at Mashable
SEO Stars

It’s very comfortable to know I can rely about all technical issues on Hostseo and mostly that my website and emails are safe and secured here.

Read More

Isaac H. Entrepreneur
SEO Stars

With hostseo as a hosting partner we are more flexible and save money due to the better packages with great pricing, free SEO n' free SSL too!

Read More

Madeline E. Internet Professional