Configuring / Securing Webservices

[Kalisto]

Apologies if this isnt quite the right thread, but it was the most suitable one I could find.

Ive a webservice in VB.Net and the requirement is for the clients to log in using basic windows authentication.

Ive changed the Web Config of the webservice to read

  <authentication mode="Windows" /> 
  <authorization>
      <deny users="?" />
  </authorization>

Ive added the following to my client where the webservice is called;

Dim service As New AddNewOrder.AddNewOrderService
Dim _credentialCache As CredentialCache = New CredentialCache

Dim credentials As NetworkCredential = New _
           NetworkCredential(<<name>>, <<password>>)

_credentialCache.Add(New Uri(service.Url), "Basic", _
                              credentials)
        service.Credentials = _credentialCache

and I get a 401 error.
IIS is set up to use basic windows authentication.

So what step(s) have I missed out or got wrong here?
(name and password are those I use to log on to the machine)

Cheers

K