The TLS protocol is usually considered as a black box that somehow bestows security. But like any other protocol, it is a sequence of bits and bytes. This article explains how a bit more depth about the protocol is helpful to understand how it can be split into two dramatically different components; and how this can be incredibly useful from an operational perspective.
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Since support for XP is ending soon, and because IE on XP was the only realistic platform that fails to send SNI alongside its web requests, we can assume that SNI is everywhere. Or at least, that is a safe assumption from April 8th, 2014 -- when IE on XP is officially acknowledged by its source as an insecure browser. (Others have said the same thing for much longer already.) So it is not unlogical to stop supporting browsers without SNI.
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TLS servers often struggle with a limited amount of ports. Even when using IPv6 there may be reasons why this problems shows up; backward compatibility with IPv4 and a desire for central entrance of web traffic to your site are a few. SNItch makes it possible to switch to various backend servers based on the Server Name Indication contained in (at least) web traffic.
This article is part of a series of articles about TLS.
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