[Samba] Samba4

[sandy.napoles at eccmg.cupet.cu]

Hello list, in the follow url thereis a how to join a domain as DC
https://wiki.samba.org/index.php/Samba4_joining_a_domain
In this url thereis a step  (samba-tool drs showrepl)  when i run this
tool i have the follow error

ERROR(<class 'samba.drs_utils.drsException'>): DRS connection to bdc.
failed - drsException: DRS connection to bdc. failed: (-1073741772,
'NT_STATUS_OBJECT_NAME_NOT_FOUND')
  File "/usr/local/samba/lib/python2.6/site-packages/samba/netcmd/drs.py",
line 42, in drsuapi_connect
    (ctx.drsuapi, ctx.drsuapi_handle, ctx.bind_supported_extensions) =
drs_utils.drsuapi_connect(ctx.server, ctx.lp, ctx.creds)
  File "/usr/local/samba/lib/python2.6/site-packages/samba/drs_utils.py",
line 56, in drsuapi_connect
    raise drsException("DRS connection to %s failed: %s" % (server, e))


somebody can helpme