samba - Aug 2009 - Samba 3.3.2, in win2k only root can join domain

Hi i have a fresh install of samba server and ldap in ubunut 9.04
it work 
grant that privilges 
root at serverbb:~# net rpc rights list accounts -U root%-------
BUILTIN\Print Operators                                         
No privileges assigned                                          

BUILTIN\Account Operators
No privileges assigned   

BUILTIN\Backup Operators
No privileges assigned  

BUILTIN\Server Operators
No privileges assigned

BUILTIN\Administrators
SeMachineAccountPrivilege
SeTakeOwnershipPrivilege
SeBackupPrivilege
SeRestorePrivilege
SeRemoteShutdownPrivilege
SePrintOperatorPrivilege
SeAddUsersPrivilege
SeDiskOperatorPrivilege

Everyone
No privileges assigned

GRUPORESASCO\Domain Admins
SeMachineAccountPrivilege
SeRemoteShutdownPrivilege
SePrintOperatorPrivilege
SeAddUsersPrivilege
SeDiskOperatorPrivilege


 create a user administrador tha is member of Domain admins in samba an 
administrator in unix
in xp that account can join machin to domain
but in win2k only with root i can, too when try to add user  account to local 
administrator group popup a login windows ?

?


sorry my english