Can't connect with https to a cloudfront(amazon) server - authentication/decryption failed

Hi All
I'm using the following code to to receive a response from a secured server (Unity version 5.2.3):

WebClient client = new WebClient(); //I'm using this and not the 'WWW" class because I'm using threading for this).

byte[] bytes = client.DownloadData("https://SomeSecuredServer");

But I'm getting the following error:
"Error getting response stream (Write: The authentication or decryption has failed.): SendFailure"

A few things I've tried:

1. initializing the...

Can't connect with https to a cloudfront(amazon) server - authentication/decryption failed