webservice 401

[doug]

hello,

i am getting a "The request failed with HTTP status 401: Unauthorized." when
calling a 2.0 web service.

i am setting the Credentials:
CredentialCache credentials = new CredentialCache();
NetworkCredential networkCredential = new NetworkCredential ("u", "p", "d");
vcService.Credentials = credentials;
App.localhost.AppOutput vcResult = vcService.Test();


any other requirements?