How to enable TLS 1.1, 1.2 in IIS 7.5
Reboot. Changes to Schannel settings do not take effect until the system is rebooted.
The easiest way to make changes in Microsoft SChannel protocols and ciphers (including cipher ordering) is to use IIS Crypto which is a completely free tool that can be downloaded without any kind of annoying registration requirements.
The tool manipulates the registry keys under the covers however it does so in a controlled, proven and safe way. We use it regularly.
It is also worth noting that it can help in automation scenarios as it has a command line version in addition to a GUI version.
There is also a blog that discusses some of the changes and why they have been made. The tool tends to be kept up to date when SSL issues arise.