Jerry, Thanks to a lot of advice from John Terpstra, I believe I have solved the problem. The root user must be in the ldap database, and its password must be set (I used smbldap-passwd for this). On the Windows side, use the Administrator user to add the machine to the domain.
The only thing I'm not sure of is the relationship between the Windows Administrator user and the Linux root user. -- Don Watson -- To unsubscribe from this list go to the following URL and read the instructions: https://lists.samba.org/mailman/listinfo/samba