Microsoft
Made it a pain for devs
.NET 3.5 and below default was 1.0 (and not really a viable nasty hack workaround without major grief)
.NET 4, default 1.1 (1.2 not even supported unless you do a nasty hack)
Needed 4.6 for 1.2 as default
So, a lot of legacy .NET apps will have issues with TLS 1.1 / 1.2
MS "it's all about the developers" ... really????