TLS 1.2, .NET Framework 4.0, and IIS 7.0 on Windows 2008 R2

Question

I have a Windows 2008 R2 server running SQL Server 2008 and a .NET Framework 4.0 Web application (CMS). Unfortunately, I cannot upgrade .Net because of the app, but I need to disable TLS 1.0 and lower. when I do that, I lose the ability to access the application unless I re-enable 1.0. Is there any way to use TLS 1.2 with .Net framework 4.0?

Answer 1

What do you mean by disabling TLS 1.0 and lower?

What you can do is to enable/set as default TLS 1.2 in your Global.asax file and it should do the job.

ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls12;

Just make sure that System.Net is imported

Edited:

If Enum value is missing you can try to do next

ServicePointManager.SecurityProtocol = (SecurityProtocolType)3072;//SecurityProtocolType.Tls1.2;

Bad news here is that you might need to replace System.dll with 4.5 version according to this post