Reporting API: error retrieving data from DLP

Hi,

i am looking for any help regarding retrieving data using API. The code successfully opens the client, but fails to retrieve data (incidentList call). The error:

"System.ServiceModel.ProtocolException was unhandled... response message does not match the content type of the binding (text/xml; charset=utf-8)"

The fault code in the return SOAP envelop:

 <faultstring>Authentication failed</faultstring>
      <detail>
        <AuthenticationFault:AuthenticationFault xmlns:AuthenticationFault="http://www.vontu.com/enforce/webservice/incident/schema" xmlns="" xmlns:ns7="http://www.vontu.com/enforce/webservice/incident/schema" reason="Authentication failed"/>
      </detail>

I am using correct crudentials to connect, userID/password combination works fine while logging from the console.

Here is the code fragment I am running, C#:

            string client_username = "userID";
            string client_password = "pass123";

            string url = "https://enforce_host/ProtectManager/services/reporting";

            EndpointAddress epAddress = new EndpointAddress(url);

            BasicHttpBinding httpBinding = new BasicHttpBinding();
            httpBinding.Security.Mode = BasicHttpSecurityMode.Transport;
            httpBinding.Security.Transport.ClientCredentialType = HttpClientCredentialType.Basic;
                        

            ReportingServicePortTypeClient client = new ReportingServicePortTypeClient(httpBinding, epAddress);

            client.ClientCredentials.UserName.UserName = client_username;
            client.ClientCredentials.UserName.Password = client_password;

            IEndpointBehavior behavior = new  HttpBasicAuthenticationEndpointBehavior();
            client.Endpoint.Behaviors.Add(behavior);

            
            client.Open();           

            IncidentListRequest request = new IncidentListRequest();

            int reportID = 999;

            request.savedReportId = reportID;

           List<int> ids = new List<int>();

            ids.AddRange(client.incidentList(request)); // --->> Execption is here 

Any suggestions are welcome!

Thanks!

Alex