[Samba] Unable to add additional domain controller - uncaught exception - LDAP error 10 on join

[Fabio Fantoni]

hi, I'm trying to add secondary samba4 dc (stretch with samba 4.5 from 
official repository) to samba4 pdc (stretch also this), I did this other 
times few years ago with older debian and samba (4.0 and 4.1 if I 
remember good).
This time always following this howto 
(https://wiki.samba.org/index.php/Joining_a_Samba_DC_to_an_Existing_Active_Directory) 
failed all time, first time because I removed tdb and ldb, redone 
without remove them and still showing error, based on a fast search I 
removed smb.conf but still give error that I'm unable to solve even with 
some search:
samba-tool domain join m2r.local DC -Uadministrator --realm=m2r.local 
--dns-backend=SAMBA_INTERNAL --option='idmap_ldb:use rfc2307 = yes'
Finding a writeable DC for domain 'm2r.local'
Found DC DUO-ADD-DC.m2r.local
Password for [WORKGROUP\administrator]:
workgroup is M2R
realm is m2r.local
Adding CN=D9DC,OU=Domain Controllers,DC=m2r,DC=local
Adding 
CN=D9DC,CN=Servers,CN=Default-First-Site-Name,CN=Sites,CN=Configuration,DC=m2r,DC=local
Adding CN=NTDS 
Settings,CN=D9DC,CN=Servers,CN=Default-First-Site-Name,CN=Sites,CN=Configuration,DC=m2r,DC=local
Join failed - cleaning up
Deleted CN=D9DC,OU=Domain Controllers,DC=m2r,DC=local
Deleted CN=NTDS 
Settings,CN=D9DC,CN=Servers,CN=Default-First-Site-Name,CN=Sites,CN=Configuration,DC=m2r,DC=local
Deleted 
CN=D9DC,CN=Servers,CN=Default-First-Site-Name,CN=Sites,CN=Configuration,DC=m2r,DC=local
ERROR(ldb): uncaught exception - LDAP error 10 LDAP_REFERRAL - 
<0000202B: RefErr: DSID-030A0B09, data 0, 1 access points
         ref 1: 'a45ce9be-c350-4429-964b-a10c1dd92af5._msdcs.m2r.local'
 > <ldap://a45ce9be-c350-4429-964b-a10c1dd92af5._msdcs.m2r.local>
   File "/usr/lib/python2.7/dist-packages/samba/netcmd/__init__.py", 
line 176, in _run
     return self.run(*args, **kwargs)
   File "/usr/lib/python2.7/dist-packages/samba/netcmd/domain.py", line 
652, in run
     machinepass=machinepass, use_ntvfs=use_ntvfs, dns_backend=dns_backend)
   File "/usr/lib/python2.7/dist-packages/samba/join.py", line 1253, in 
join_DC
     ctx.do_join()
   File "/usr/lib/python2.7/dist-packages/samba/join.py", line 1151, in 
do_join
     ctx.join_add_objects()
   File "/usr/lib/python2.7/dist-packages/samba/join.py", line 630, in 
join_add_objects
     ctx.samdb.modify(m)
Can someone help me please?

Thanks for any reply and sorry for my bad english.



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