如何修复以使用TLS 1.2

Question

I am using Windows 10, Visual Studio 2017, .Net 4.7. And using DocuSign SOAP APIs to send an envelope. My code is using .NET 4.7 - checked in web.config and confirmed in project properties > Application tab.

And yet, I keep getting the error from DocuSign that I need to use TLS 1.2 and that I am using TLS 1.

What else can I do to fix this?

Answer 1

You can always force the TLS version yourself with:

ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls12;

However, this shouldn't be necessary under .NET Framework 4.7. TLS 1.2 is the default.

See also this blog post from Docusign .