[Samba] Help, DNS forwarding not working!

Ole Traupe ole.traupe at tu-berlin.de
Tue May 29 12:05:23 UTC 2018

Please ignore, resolved now (although I don't know why or how). Strange 
that things always resolve only after (!) posting to this list. The 
latter seems to work in magic ways. ;)

Rowland, thank you very much for your quick replay!! I was able to ping 
the forwarder, but i wasn't able to resolve any hostnames on the DCs 
themselves. After I restarted the samba services, the issue went away. I 
did some changes to the smb.conf and only applied them via "smbcontrol 
all reload-config". Seems that a complete service restart was necessary 
for whatever reason.

Thanks again!

On 29.05.2018 13:59, Rowland Penny via samba wrote:
> On Tue, 29 May 2018 13:40:50 +0200
> Ole Traupe via samba <samba at lists.samba.org> wrote:
>> Hi list,
>> Today, DNS forwarding stopped working for my domain, and I have no
>> clue as to why. We are using Samba internal DNS.
>> It stopped working for one DC on old hardware a couple of days ago. I
>> suspected a hard drive issue (bad blocks in DNS related files) and
>> wanted to replace the server in the next days.
>> Today I rebooted the other DC due to maintenance of the host machine,
>> and DNS forwarding stopped working there as well.
>> I am puzzled as everything else seems to be working fine (Windows
>> log-ons, file access on a member server).
>> Where can I look, what can I do?
>> Please help. This domain is in production and we basically don't have
>> any internet now.
>> Thanks,
>> Ole
> First post your smb.conf
> Can you ping the forwarder from the DC ?
> Is anything listening on port 53 on the DC ?
> Is anything listening on port 53 on the DC that shouldn't be ?
> OS ?
> Samba version ?
> Rowland

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