HttpWebRequest and Authentication

[ashurack]

I can't seem to get this to work. The URL I want to access is protected with windows authentication. I thought that was NTLM but the following isn't working:

string url = "http://apps.pgalinks.com/professionals/apps/directories/searchresults.cfm?entity_id=" + Convert.ToString(i);
            HttpWebRequest request = (HttpWebRequest)WebRequest.Create(url);
            request.Method = "GET";
            request.KeepAlive = true; 
            request.Accept = @"*/*";
 
            NetworkCredential credential = new NetworkCredential("xxxx", "xxxx", "http://apps.pgalinks.com"); 
            CredentialCache credentialCache = new CredentialCache();
            credentialCache.Add(new Uri(url), "NTLM", credential); 
            request.Credentials = credentialCache;
 
            HttpWebResponse response = null;
            response = (HttpWebResponse)request.GetResponse();

The error is on the last line "response = (HttpWebResponse)request.GetResponse();".

I don't know if this information is usefull...:
"The remote server returned an error: (401) Unauthorized."
"System.Net.WebExceptionStatus.ProtocolError"
"{Content-Type: text/html
Set-Cookie: SMCHALLENGE=YES; path=/; domain=.pgalinks.com
WWW-Authenticate: Basic realm="professionals [23:00:47:2976]"}"