But why it works for the local admin?
(okok, could be the same credentials as in the domain)

other suggestion: are there any other Mappings to the same Server "Fred" does before?
Windows Servers won't let you map two Shares with different Credentials from the same Client via \\servername\share.
if so, try \\serverip\share.
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german native-> poor english sysadmin-> poor german...