The remote server returned an error: (401) Unauthorized.

Hi All,
      I am trying to access the below mentioned URL by using below code and i am getting error saying Unauthorzed. Can you guys help me whether below code what i have 
coded has any issues?
public static void Main(string[] args) {
string requestUrl = "http://54.215.14.255/services/user/initiateRegistration";
HttpWebRequest request = WebRequest.Create(requestUrl) as HttpWebRequest;
// StringBody webId = new StringBody("99936160"); HttpRequestHeader emailId = new HttpRequestHeader(); HttpRequestHeader rrNumber = new HttpRequestHeader();// ""; request.Headers.Add("emailId", "rdubey3@sapient.com"); request.Headers.Add("rrNumber", "673484387");
WebResponse rer= request.GetResponse();
}
...