Hyper-V Program Manager
If you are getting an "Authentication Error" when trying to connect to a virtual machine under Hyper-V, you can open the Hyper-V Settings (from the main MMC page) and disable the use of default credentials under the User Credentials section. Once you have made this change the Virtual Machine Connection will start to prompt you for credentials when you try to connect to a virtual machine.
Three things to note:
Does the authentication require a two way trust?
Our hyper-V boxes are running in a domain with a one way trust between our corporate domain and it. I can't seem to use the Hyper-V manager from a machine in the corporate domain.
Yes - two way trust is required. This is because WMI (which we use) has the server call back to the client.