asp.net - TLS 1.2 in .NET Framework 4.0

Question

I have a Windows server 2008 R2 server running a dozen .NET Framework 4.0 WebForms applications, and I need to disable TLS 1.0 and lower. When I do that, all secure connections fail and I was forced to re-enable TLS 1.0. Is there any way to use TLS 1.2 in a framework 4.0 environment? Perhaps I am missing something?

Also, due to limitations of the version CMS we are using, we cannot upgrade the Framework at this time.

Answer 1

If you are not able to add a property to system.net class library.

Then, add in Global.asax file:

ServicePointManager.SecurityProtocol = (SecurityProtocolType)3072; //TLS 1.2
ServicePointManager.SecurityProtocol = (SecurityProtocolType)768; //TLS 1.1

And you can use it in a function, at the starting line:

ServicePointManager.SecurityProtocol = (SecurityProtocolType)768 | (SecurityProtocolType)3072;

And, it's being useful for STRIPE payment gateway, which only supports TLS 1.1, TLS 1.2.

EDIT: After so many questions on .NET 4.5 is installed on my server or not... here is the screenshot of Registry on my production server:

I have only .NET framework 4.0 installed.