Whichever identity mapping solution you use, your domain controller must be able to authorize access to NFS resources in ...

Whichever identity mapping solution you use, your domain controller must be able to authorize access to NFS resources in the domain.  This requires doing one of the following:    1.  If all domain controllers are running Windows Server 2003 or later, ensure the functional level has been raised to Windows Server 2003 or later.    2.  If the functional level of the domain cannot be raised to Window Server 2003 or later, install Server for NFS Authentication on all domain controllers.