Authentication failed because the remote party has closed the transport stream exception when getting a response from webservice

I am calling a third party service and when I ask for a response it throws out an exception that says

"Authentication failed because the remote party has closed the transport stream exception".

I think that there is a problem in sending credentials. I have even tried supplying new credentials. Here is the full code

string get_url = "https://**.*******.com/com/******/webservices/public_webservice.cfc?wsdl&Method=CreateUser&SiteID=**&WSPassword=******&UserName=******";
HttpWebRequest request = (HttpWebRequest)WebRequest.Create(get_url);
request.MaximumAutomaticRedirections = 4;
request.MaximumResponseHeadersLength = 4;
request.Credentials = CredentialCache.DefaultCredentials;
//request.UseDefaultCredentials = false;
//request.Credentials = new System.Net.NetworkCredential("*****", "*****");
request.ContentType = "application/x-www-form-urlencoded; charset=ISO-8859-1";

// Show the sent stream
//lbl_send_stream.Text = send_stream;
//lbl_send_stream.Text = get_url;
// Get UserId And LoginToken From Third Party DB
// ==============================================
//Exception gets throwed When code hits here
HttpWebResponse response = (HttpWebResponse)request.GetResponse();

I found the answer, It was because the third party webservice we were calling did not support TLS 1.0 they supported 1.1 and 1.2. So I had to change the security protocol.

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

I have the same issue, initially I changed the security protocol but it didn't work, then I realize that I need to change security protocol before creating the WebRequest:

  ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls12 | SecurityProtocolType.Tls11 | SecurityProtocolType.Tls | SecurityProtocolType.Ssl3;
        WebRequest request = WebRequest.Create(fullURL);
        request.Headers = requestHeaders;
        byte[] Bytes = System.Text.Encoding.ASCII.GetBytes(jsonData);