[Samba] "Failed to find a writeable DC for domain" joining to win2k3 AD DC

Daniel Müller mueller at tropenklinik.de
Tue Aug 13 23:51:45 MDT 2013

Look at your /etc/resolv.conf
There should be an entry of your existing DC in it ex.: nameserver
And you should be able to ping the existing DC.


EDV Daniel Müller

Leitung EDV
Tropenklinik Paul-Lechler-Krankenhaus
Paul-Lechler-Str. 24
72076 Tübingen

Tel.: 07071/206-463, Fax: 07071/206-499
eMail: mueller at tropenklinik.de
Internet: www.tropenklinik.de
-----Ursprüngliche Nachricht-----
Von: samba-bounces at lists.samba.org [mailto:samba-bounces at lists.samba.org] Im
Auftrag von Kevin Field
Gesendet: Dienstag, 13. August 2013 16:15
An: samba at lists.samba.org
Betreff: [Samba] “Failed to find a writeable DC for domain” joining to
win2k3 AD DC

I have a CentOS 6.4 box with SerNet's Samba 4.0.8 installed and no smb.conf
file yet, as it should be. I want it to become an AD DC in my existing
Windows domain, replicating from the existing Windows Server
2003 box. I have SELinux enabled and want it to stay that way.

I'm getting this error trying to run samba-tool:

$ sudo samba-tool domain join currentwindowsadserver.mydomain.lan DC
-Uadministrator --realm=currentwindowsadserver.mydomain.lan
Finding a writeable DC for domain 'currentwindowsadserver.mydomain.lan'
ERROR(exception): uncaught exception - Failed to find a writeable DC for
domain 'currentwindowsadserver.mydomain.lan'
   File "/usr/lib64/python2.6/site-packages/samba/netcmd/__init__.py",
line 175, in _run
     return self.run(*args, **kwargs)
   File "/usr/lib64/python2.6/site-packages/samba/netcmd/domain.py",
line 552, in run
     machinepass=machinepass, use_ntvfs=use_ntvfs, dns_backend=dns_backend)
   File "/usr/lib64/python2.6/site-packages/samba/join.py", line 1082, in
     machinepass, use_ntvfs, dns_backend, promote_existing)
   File "/usr/lib64/python2.6/site-packages/samba/join.py", line 73, in
     ctx.server = ctx.find_dc(domain)
   File "/usr/lib64/python2.6/site-packages/samba/join.py", line 246, in
     raise Exception("Failed to find a writeable DC for domain '%s'" %

I have a StackExchange thread open with all the things I've tried changing
and all the things I've verified so far:


I'd appreciate any pointers.  I seem to have run out of things to try.

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