I've been asked to look at a server for a customer as they are having trouble getting TLS 1.1 or 1.2 support to work. Their server integrates with a payment provider who will be requiring 1.2 soon.
According to Microsoft, this should be supported since they released update 4019276. https://support.microsoft.com/en-us/help/4019276/update-to-add-support-for-tls-1-1-and-tls-1-2-in-windows
However, Windows Update does not seem to list this update, and attempting to install manually just returns "The update does not apply to your system"
I'm at a loss as to why this update refuses to install.
Edit: Answering some questions from the first answer
- The update does not appear to be installed unless there's something broken causing it to not appear in Programs/Features
- The requirements for the update list only SP2 which is installed
- The customer is using IISCrypto to manage settings but this does not list 1.1 or 1.2 as an option.