I kept getting errors in my smbd.log file when I started samba. They looked like this:

[2007/10/19 13:55:38, 0] smbd/server.c:main(847)
  smbd version 3.0.23c-2.el5.2.0.2 started.
  Copyright Andrew Tridgell and the Samba Team 1992-2006
[2007/10/19 13:55:38, 0] services/services_db.c:svcctl_init_keys(420)
  init_services_keys: key lookup failed! (WERR_ACCESS_DENIED)
[2007/10/19 13:55:38, 0] smbd/server.c:main(960)
  ERROR: failed to setup guest info.

I fixed all these errors by adding this line to my /etc/samba/smb.conf file

       winbind nested groups = no

Now after creating a temporary root user in my ldap database, I can run the following:

[root@server samba]# net rpc rights list -U root
Password:
     SeMachineAccountPrivilege  Add machines to domain
      SeTakeOwnershipPrivilege  Take ownership of files or other objects
             SeBackupPrivilege  Back up files and directories
            SeRestorePrivilege  Restore files and directories
     SeRemoteShutdownPrivilege  Force shutdown from a remote system
      SePrintOperatorPrivilege  Manage printers
           SeAddUsersPrivilege  Add users and groups to the domain
       SeDiskOperatorPrivilege  Manage disk shares