Logon Failure: the user has not been…

There is this windows 2000 server, sp3 + all hot fixes installed, to which a network drive can’t be mapped to.

From it, any network drive can be mapped to any machine with available shares.

It was working fine, now when I try mapping a networkdrive I get the following error: Logon failure: the user has not been granted the requested logon type at this computer (the win2000 server machine)

Can anyone please advice ?
thanks.