gSoap client implementation to a MS web service

[Kevin]

I keep getting 401 errors when I try connecting to a MS web service
(using VB .NET) with a gSOAP web client. I have a MS implemented web
client which works fine. According to the gSOAP instructions, adding
name/password/authrealm should address it, but I am not having any
success.

Has anyone else run into issues like this? Why should I need to add
name/password in gSOAP, when the MS implementation doesn't need it?
Would it have something to do with DefaultCredentials or Integrated
Authentication?

Thanks,

-Kevin