We have tested our SSL certificate using SSL labs and the grade is capped to C as the Server supports RC4. We have made changes to the registry as well as used a tool called IIS crypto to make the changes.
I am so sure that RC4 is disabled at the registry end as well as IIS crypto's 'Best practices'.
But, there are no changes taken place when a test is performed. The SSL test still shows that RC4 is enabled. I have tried different SSL checkers and the result is the same.
We also need to enable the Forward secrecy on the system.