WCF error: The caller was not authenticated by the service

Question

I am trying to access my WCF service on a server from my client console application for testing. I am getting the following error:

The caller was no

Answer 1

This can be caused if the client is in a different domain than the server.

I encountered this when testing one of my applications from my PC(client) to my (cloud) testing server and the simplest solution i could think of was setting up a vpn.