401 Unauthorized on HttpWebRequest with DefaultCredentials (2003)

Hi all,

In moving an app from server 2000 to server 2003, we started getting
errors from this code. It pulls a page (on the same web server) using a
web request. This is an intranet site, and integrated windows
authentication is turned on. Same exact code works fine on a Windows
2000 server.

The error is: "The remote server returned an error message: 401
Unauthorized". Can anybody point us to what might be configured wrong?

Thanks,
Ian

//--------------------------------------------------
using System.Net;
using System.IO;
//...
private string GetWebPage(string url)
{
HttpWebRequest w = (HttpWebRequest)WebRequest.Create(url);
w.Credentials = CredentialCache.DefaultCredentials;
HttpWebResponse r =(HttpWebResponse)w.GetResponse();
StreamReader webstream = new StreamReader(r.GetResponseStream(),
System.Text.Encoding.Default);
//....
}
//--------------------------------------------------

.

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