c# - The request was aborted: Could not create SSL/TLS secure channel

Question

My customer has informed my of issues with their SSL and Internet Explorer. They said they get trust issues when accessing the URL.

I am accessing JSON through HTTPS. The website sits on one server and I am using the console app on my local machine. I am trying to bypass the SSL Cert, however, my code still fails.

Can I alter HttpWebRequest to fix this problem?

I get this error using this code:

    // You must change the URL to point to your Web server.
        HttpWebRequest req = (HttpWebRequest)WebRequest.Create(url);
        req.Method = "GET";
        req.AllowAutoRedirect = true;

        // allows for validation of SSL conversations
        ServicePointManager.ServerCertificateValidationCallback = delegate { return true; };


        WebResponse respon = req.GetResponse();
        Stream res = respon.GetResponseStream();

        string ret = "";
        byte[] buffer = new byte[1048];
        int read = 0;
        while ((read = res.Read(buffer, 0, buffer.Length)) > 0)
        {
            //Console.Write(Encoding.ASCII.GetString(buffer, 0, read));
            ret += Encoding.ASCII.GetString(buffer, 0, read);
        }
        return ret;

Answer 1

I had to enable other security protocol versions to resolve the issue:

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