How can I get authentication to access Doors NG with OSLC using oslc4net

I'm trying to access resources in DOORS NG using C# and the oslc4net libraries.

I'm following the example code which is in RRCFormSample.cs.

However, even though  step 1 and 2 function without error, when I try to get the service provider catalog I get the error The remote server returned an error: (401) Unauthorized.

Could somone tell me if what I'm doing is the right way to become authorized?

By the way, if I log in with these credentials into the browser, it works fine.

Regards,

Ian     

            String webContextUrl = "https://iw.airbus.com:9443/rm/";
            String user = "jean-luc";
            String passwd = "jean-luc";
            String projectArea = "JKE Banking (Requirements Management)";
	

            //STEP 1: Initialize a Jazz rootservices helper and indicate we're looking for the RequirementManagement catalog
            JazzRootServicesHelper helper = new JazzRootServicesHelper(webContextUrl, OSLCConstants.OSLC_RM_V2);
            //STEP 2: Create a new Form Auth client with the supplied user/password
            //RRC is a fronting server, so need to use the initForm() signature which allows passing of an authentication URL.
            //For RRC, use the JTS for the authorization URL
            //This is a bit of a hack for readability.  It is assuming RRC is at context /rm.  Could use a regex or UriBuilder instead.
            String authUrl = webContextUrl.Replace("/rm", "/jts"); // XXX - should be ReplaceFirst(), if it existed
            JazzFormAuthClient client = helper.InitFormClient(user, passwd, authUrl);
		    //STEP 3: Login in to Jazz Server
            if (client.FormLogin() == HttpStatusCode.OK)
            {
                string Choice = "https://iw.airbus.com:9443/rm/discovery/RMCatalog";
                HttpWebRequest request = (HttpWebRequest)WebRequest.Create(Choice);
	

**AUTHENTICATION ERROR OCCURS ON NEXT LINE****
                HttpWebResponse response = (HttpWebResponse)request.GetResponse();
                Stream stream = response.GetResponseStream();
                StreamReader reader = new StreamReader(stream);
                string data = reader.ReadToEnd();
                reader.Close();
                stream.Close();