samba - Jul 2003 - samba 2.2.8a and MSCS ( windows 2000 cluster)

I have a  samba 2.2.8a  PDC. 
I want join my windows 2000 cluster on this PDC. I join first node without 
problem. The problem is with second node. When I try join this node i 
recieve this error: 
" mydomain\root does not have permission to administer the cluster . 
Please use an account that has access privileges to the cluster"

I have verify the permission of user root on first node , and it's  ok. 
There isn't any error on the log files. 
Any idea? 

Thank's a lot . 
Bye Giovanni


P.S. My smb.conf
[global]
        workgroup = MYDOMAIN
        netbios name = IPLANET
        server string = MYDOMAIN
        interfaces = 10.10.5.156
        bind interfaces only = Yes
        encrypt passwords = Yes
        update encrypted = Yes
        time server = Yes
        lpq cache time = 120
        socket options = TCP_NODELAY SO_RCVBUF=8192 
SO_SNDBUF=8192
        domain admin group = @sistemi @helpdesk @service
        add user script = /usr/sbin/useradd -d /dev/null -g 132 -s /bin/false -
M %u
        logon script = %G_%U.bat %G %U
        logon path         logon home         domain logons = Yes
        os level = 65
        preferred master = Yes
        domain master = Yes
        wins support = Yes
        ldap server = ldapmaster.mydomain.it
        ldap port = 389
        ldap suffix = "ou=people,o=mydomain,c=it"
        ldap admin dn = "cn=Directory Manager"
        ldap ssl = no
        admin users = root @sistemi
        wide links = No