The SNI feature enables you to bind multiple certificates to a single virtual server. This is in contrast to the wildcard certificates, which refer to subdomains within a domain and not individual domains similar to the SNI feature.

As the server is able to see the virtual domain, it serves the client with the website he/she requested. A win-win for everyone! Is SNI Scalable? The biggest and perhaps the only concern with SNI was its scalability. Initially, there weren’t many web browsers and servers supporting SNI technology. Today, that scenario has turned upside down.

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It allows the client to indicate the Fully Qualified Domain Name (FQDN) of the web server instance it wishes to connect to. This in turn permits the server to respond by presenting the correct TLS/SSL certificate. SNI stands for Server Name Indication and is an extension of the TLS protocol.

Subject: SSL, Server Name Identification (SNI) and the Powered by Apache HTTP IBM i Web Server, Author: bvstone.

Today, that scenario has turned upside down. Security plays a big role on the internet. As a result, there are standards, certificates, and protocols that try to protect users as well as servers from malicious attacks.

Server Name Indication is a protocol that helps match domains to SSL certificates.
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What this effectively means is that the virtual domain name, or a hostname, can now be used to identify the network end point. SNI is an extension of the Transport Layer Security (TLS) protocol.

SNI is an addition to the TLS protocol that enables a server to host multiple TLS certificates at the same IP address. The Server Name Indication protocol (SNI) allows a web server such as Apache to determine the domain name for which a particular secure incoming connection is intended outside of the page request itself. While that may not sound like much, its impact is quite significant.
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Require Server Name Indication is the option in Web Site Binding that allows binding multiple certificates to different websites with the same IP address: For such SNI bindings the ServerName header will be expected by the server. If a non-SNI capable client attempts HTTPS connection,

SNI allows multiple SSL certificates using different domain names to leverage a single dedicated IP address. With SNI, you can have many virtual hosts sharing the same IP address and port, and each one can have its own unique certificate (and the rest of the configuration). If both Apache Server and browser support SNI, then the hostname is included in the original SSL request, and the web server can select the correct SSL virtual host. SNI - Server Name Identification (virtual hosting for SSL nodes)¶ uWSGI 1.9 (codenamed “ssl as p0rn”) added support for SNI (Server Name Identification) throughout the whole SSL subsystem. The HTTPS router, the SPDY router and the SSL router can all use it transparently. With Server Name Indication (SNI), a web server can have multiple SSL certificates installed on the same IP address.

TLS - Transport Layer Security; SNI - Server Name Indication; ACME Validation; OV - Organization Validation; JWS - JSON Web Signature

This is in contrast to the wildcard certificates, which refer to subdomains within a domain and not individual domains similar to the SNI feature. Web Application Proxy (part of Windows Server 2012 R2, replacement of ADFS proxy) is also by default setup (by the Web Application Proxy Configuration Wizard) to require Server Name Indication. Like the WebDav client does not support Server Name Indication (SNI) situation, ARR is non-SNI capable. I'm using Microsoft.Web.Administration (inside a Wix CustomAction) to configure Server Name Indication and bind to an existing server certificate on a IIS 8.5 site. Turns out, setting SNI takes off the certificate binding. The following code will make things clearer: In the world of TLS, Server Name Indication or SNI is a feature that allows clients (aka your web browser) to communicate the hostname of the site to the shared server. It’s in essence similar to the “Host” header in a plain HTTP request.