The request was aborted: Could not create SSL/TLS secure channel.

EXCEPTION: The request was aborted: Could not create SSL/TLS secure channel.

Solution:

C#
ServicePointManager.SecurityProtocol |= SecurityProtocolType.Ssl3 | SecurityProtocolType.Tls12 | SecurityProtocolType.Tls11 | SecurityProtocolType.Tls;

Target framework
.NET Framework 4.6.2