the request was aborted could not create ssl/tls secure channel excel addins code example

Example: C# The request was aborted: Could not create SSL/TLS secure

ServicePointManager.Expect100Continue = true;
            ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls
                   | SecurityProtocolType.Tls11
                   | SecurityProtocolType.Tls12
                   | SecurityProtocolType.Ssl3;