Oh yes, what I meant by that was going into "map network drive in windows" and attempting to map \\"Filer's IP Address"\C$
Selecting "use diferent credentials"
And typing either filername\local account + its password, or domain\domain admin account + password will result in a windows popup that says: "The account is not authorized to log in from this station"
Deliberately mistyping the account name or password instead results in an "invalid username or password" error.
This happened before we had the filer on the domain, and it is still happening after.