C# and dotnet 4.7.1 not adding custom certificate for TLS 1.2 calls

Question

I have the following C# code, constructing an https call with a custom certificate. When using Tls 1.1, the call works fine. When using Tls 1.2 the call breaks. I using curl

Answer 1

Shouldn't you specified the handler's SslProtocols property?

Try adding this line after hander definition:

handler.SslProtocols = SslProtocols.Tls12;