The HTTP request is unauthorized with client authentication scheme 'Negogiate'. The authentication header ... was 'Negotiate,Kerberos,NTLM'

Question

We're trying to get data from an external web service using VB.Net.

We added a Service Reference, provinding the correct WSDL.

Our code for getting data is:

    Dim MyClient As New ExtConn.GetConnectorSoapClient()

    MyClient.ClientCredentials.UserName.UserName = "AOL\12345.abcde"
    MyClient.ClientCredentials.UserName.Password = "pass123"

    Dim MyReq As New ExtConn.GetDataRequest
    Dim MyResponse As New ExtConn.GetDataResponse

    Dim MyCred As New System.ServiceModel.Description.ClientCredentials()

    Dim MyReqBody As New ExtConn.GetDataRequestBody("Environment123", "AOL\12345.abcde", "pass123", "12345.abcde", "GetData", "")

    MyReq.Body = MyReqBody

    MyResponse = MyClient.ExtConn_GetConnectorSoap_GetData(MyReq)

    MsgBox(MyResponse.Body.GetDataResult)

Our app.config is:

<?xml version="1.0" encoding="utf-8" ?>
<configuration>
<startup>
    <supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.5" />
</startup>
<system.serviceModel>

    <bindings>
        <basicHttpsBinding>
            <binding name="GetConnectorSoap">
              <security mode="Transport"  >
                <transport clientCredentialType="Ntlm" realm="" />
                <message clientCredentialType="UserName"  />
              </security>
            </binding>

        </basicHttpsBinding>
    </bindings>
    <client>
        <endpoint address="https://ota.externalservice.nl/ourservices/getconnector.asmx"
            binding="basicHttpsBinding" bindingConfiguration="GetConnectorSoap"
            contract="ExtConn.GetConnectorSoap" name="GetConnectorSoap" />
    </client>
</system.serviceModel>
</configuration>

The respons is:

The HTTP request is unauthorized with client authentication scheme 'Ntlm'. The authentication header received from the server was 'Negotiate,Kerberos,NTLM'.

My questions are: what are we doing wrong? If NTLM is accepted as authentication mode, why do we get this error?

user4737432 user4737432 · Accepted Answer · 2015-04-01T13:36:06

You could try to add it as an web reference (Add service reference > Advanced.. > Add Web reference)

GetConnector connector = new GetConnector();
connector.Credentials = new NetworkCredential("username", "password", "domain");
string response = connector.GetData();

The HTTP request is unauthorized with client authentication scheme 'Negogiate'. The authentication header ... was 'Negotiate,Kerberos,NTLM'

1 Answers