"A domain controller for your domain could not be contacted. You have been logged on using cached account information. Changes to your profile since you last logged on may not be available."

"Could not find domain controller for this domain."

The error messages and conditions may not be consistent even though you may still be able to sucessfully redirect a drive across the NAT, and browse across the NAT.

The reason why this does not function, is because the source IP address in the NetBIOS header will not be translated with IP NAT.

More information on this is available on Microsoft's web site, in Knowledge Base Article ID: Q172227.
address-suppressed