Error in Console App:"The request was aborted: Could not create SSL/TLS secure channel."

[QuickDeveloper]

Hi All I am calling a REST API from my C# Console application and get the following error while calling GetResponse method "The request was aborted: Could not create SSL/TLS secure channel." The code has worked before couple of days back , so I am not sure what changed. The cert I am using is valid cert installed on my machine where I run the code, I checked the expiration details and all. My code is as follows, it fails in the try block below.The uri that I pass is this -https://management.core.windows.net/{0}/services/hostedservices[^] I replace the {0} with a valid id ofcourse. Code:

public static XDocument GetResponse(Uri uri)
{
HttpWebRequest request = (HttpWebRequest)HttpWebRequest.Create(uri);
request.Method = "GET";
request.Headers.Add("x-ms-version", msVersion);
request.ClientCertificates.Add(certificate);
request.ContentType = "application/xml";

        XDocument responseBody = null;
        HttpWebResponse response;

        try
        {
            **response = **(HttpWebResponse)request.GetResponse();****
        }
     catch (WebException ex)
 {
     response = (HttpWebResponse)ex.Response;
 }

}

Exception: The complete exception is: System.Net.WebException was caught HResult=-2146233079 Message=The request was aborted: Could not create SSL/TLS secure channel. Source=System StackTrace: at System.Net.HttpWebRequest.GetResponse() at StorageAccountsExtractor.AzureService.GetResponse(Uri uri) in e:\StorageAccountsRetriever\StorageAccountsExtractor\StorageAccountsExtractor\Program.cs:line 289 InnerException: Solution: I looked on the web and looks like I need to make HTTPS use TLS? how do I do that.Any other ideas that I could look into?

"Every morning I go through Forbes list of 40 richest people in the world. If my name is not in there, I go to work..!!!"

[BobJanova]

If it was working a couple of days ago it's almost certainly that something has expired, either your SSL certificate, the server's certificate (though that is unlikely if you're using a hosted service), your user name or API key.