TLS 1.2 has been in born since 2008 and yet many of us did not know about it until new requirement came to us...
To enforce the TLS 1.2 in a website, you need to add a Global.asax and then add the following line:
void Application_Start(object sender, EventArgs e)
{
System.Net.ServicePointManager.SecurityProtocol = (System.Net.SecurityProtocolType)3072;
}
Once the above code has been added, all HTTP request will be served in TLS 1.2 that includes the web service (ASMX) and HTTP request call to external website. And make sure that the project is compiled under .Net 4.6 and everything will be ok.
Notes: your program will work with TLS1.2 only. An exception will be thrown if the server does not enabled TLS 1.2.
There is a catch... if some other app is consuming the resource on your website, they must be on TLS 1.2 as well. Otherwise they will fail to make any connection to your website.
