Vista - transfer files between different domain

Hi all,

I have solved my problems by reading this article
http://msdn2.microsoft.com/en-us/library/ms731925.aspx

Now I have another problem. I have one server and many client that should
communicate each other to transfer files. I mean server can send files to
clients and clients can send files to server. The problem is clients in
different domain and many of them are not join domain. I use netTcpBinding
and security mode is none. When I test my code, an exception message is
throwing: "Logon failure: unknown user name or bad password."

I added my code in client side
client.ClientCredentials.Windows.ClientCredential.UserName = "laura";
client.ClientCredentials.Windows.ClientCredential.Password = "password";

But still it doesn't work and an exception message is still same.
What I have to do to fix this error? Any helps would be appreciated. Thank
you so much.

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Best Regards,
Laura