[Samba] Samba4 Multi-Master replication

Morten Kramer node1011 at googlemail.com
Mon Jun 11 04:01:40 MDT 2012

Hi guys,

I'm trying to get the Samba4 multi-master replication to work.

I set up the primary domain controller using this howto (under CentOS 
6.2 x64):


I installed bind 9.8.3 and enabled encrypted dns updates.

I set up another VM with the same CentOS version and oriented myself on 
this howto:


to join the second DC into the domain. I edited /etc/resolv.conf and set 
the nameserver to the IP of the primary DC (bind dns server).

Basic replication seems to work (not doing the rsync for sysvol yet). 
However, when i take the primary DC offline, I can't use any of the .msc 
domain admin tools anymore.

I always get an error message, telling me that there is no RPC server 
When i run gpmc.msc i can choose the DC i want to work on and I can see 
the secondary one, but it will come back with the RPC error.

User authentication does still work and Kerberos tickets are generated 
by the 2nd DC.

I can find this in the log:

../source4/dsdb/kcc/kcc_topology.c:1402: failed to find nCName attribute 
of object 
../source4/dsdb/kcc/kcc_topology.c:3158: failed to color vertices: 
../source4/dsdb/kcc/kcc_topology.c:3415: failed to create connections: 
Warning: 60 extra bytes in incoming RPC request
../source4/rpc_server/drsuapi/dcesrv_drsuapi.c:74: doing DsBind with 

Do i need to configure something extra, so the secondary DC will be able 
to act as an RPC server?


More information about the samba mailing list