Getting Error “The remote server returned an error: (403) Forbidden” when screen scraping using HttpWebRequest.GetResponse()

Hi friends,
            i am using httpwebrequest class to get response from a website. my code working fine in development machine.
          But when i uploaded it to  web hosting server then it return 403 forbidden error.
          i cant debug the code.  any body have any answer. my code as follows

 CookieContainer objContainer = new CookieContainer();
Stream dataStream = null; StreamReader reader = null;
string strServerResponse = "";

HttpWebRequest request = (HttpWebRequest)HttpWebRequest.Create("https://www.tdscpc.gov.in/app/login.xhtml"); //------------------------------------- // request.CookieContainer = objContainer; request.KeepAlive = false; request.Method = "GET";
// request.UseDefaultCredentials = true; // request.Proxy.Credentials = ...