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

Question

I am trying to run following code it works fine when runs on localhost IIS but returns error when hosted on my web server IIS

Error : -- The remote server returned an error: (401) Unauthorized. at System.Net.HttpWebRequest.GetResponse() at _Default.btnsubmit_Click(Object sender, EventArgs e) in e:\WebSite1\Default.aspx.cs:

try
{

var webAddr = "http://serviceserver/someService";
var httpWebRequest = (HttpWebRequest)WebRequest.Create(webAddr);
httpWebRequest.ContentType = "text/xml";
httpWebRequest.ContentLength = 0;
httpWebRequest.Method = "GET";

httpWebRequest.Credentials = new NetworkCredential("user", "password");
var httpResponse = (HttpWebResponse)httpWebRequest.GetResponse();
using (var streamReader = new StreamReader(httpResponse.GetResponseStream()))
{
var result = streamReader.ReadToEnd();
Label1.Text = result;
}
}
catch (Exception ex)
{
Response.Write(ex.Message);
Response.Write(ex.StackTrace);
Response.Write(ex.InnerException);
}