title: The request was aborted: Could not create SSL/TLS secure channel. for HttpWebRequest and WebClient
body: <p>Hi I'm getting the above error message when i try to get a response from a URL. 
  The code i've used is </p>
  
  <pre><code>HttpWebRequest ObjContentfulRequest = (HttpWebRequest)WebRequest.Create(URL);
  HttpWebResponse ObjContentfulResponse = (HttpWebResponse)ObjContentfulRequest.GetResponse();
  </code></pre>
  
  <p>and I've also tried with</p>
  
  <pre><code>using (WebClient client = new WebClient())
              {
                var json = client.DownloadString(URL);
              }
  </code></pre>
  
  <p>Please suggest what i'm missing.   <strong>The error i'm getting is  The request was aborted: Could not create SSL/TLS secure channel.</strong></p>