Hi, I have the following setup.
Exchange Server with Forms based authentication.
Customised owalogon.asp redirects to custom asp.net page to display
informationals to users

I am using WebDAV and .NET to authenticate the user in the asp.net.
The following are the links for exchange.

https://prepro01/exchange, which redirects when hit to this url ->
https://prepro01/exchweb/bin/auth/owalogon.asp?url=https://prepro01/exchange&reason=0.

In the custom asp.net page we do the following code:

string authURI = "https://prepro01" + "/exchweb/bin/auth/owaauth.dll";

           string destination = "https://prepro01" + "/exchange/";

           // Create the web request body:
           // UserFullname is DOMAIN\\username
           string body =
string.Format("destination={0}&username={1}&password={2}",
destination, userFullName, password);
           byte[] bytes = Encoding.UTF8.GetBytes(body);

           // Create the web request:
           HttpWebRequest request =
(HttpWebRequest)System.Net.WebRequest.Create(authURI);

           request.Method = "POST";
           request.ContentType = "application/x-www-form-urlencoded";
           request.CookieContainer = new CookieContainer();
           request.ContentLength = bytes.Length;

           // Create the web request content stream:
           using (Stream stream = request.GetRequestStream())
           {
               stream.Write(bytes, 0, bytes.Length);
               stream.Close();
           }

           try
           {

               // Get the response & store the authentication
cookies:
               HttpWebResponse response =
(HttpWebResponse)request.GetResponse();

               if (response.Cookies.Count < 2)
               {
                   //throw new AuthenticationException("Login failed.
Is the login / password correct?");
               }

               //cookies = new CookieContainer();
               foreach (Cookie myCookie in response.Cookies)
               {
                   request.CookieContainer.Add(myCookie);
               }

               response.Close();

               return true;
           }

When this is run I get no cookies returned. So obviously the login is
failing. But why, I am sending to the wrong links? I have pretty much
used code from Henning Krause, but no luck. WebDAV is on in the server
with Exchange now.

Any ideas?
Thanks
Eamonn