[Samba] 2nd DC, internal DNS: dns_tkey_negotiategss: TKEY is unacceptable - SOLVED

Roel van Meer roel at 1afa.com
Thu Aug 6 08:08:06 UTC 2015


L.P.H. van Belle writes:

> is the time in sync on your servers ?

Yes it is.

I managed to make it work by specifying the primary DC as nameserver in  
/etc/resolv.conf of the secondary DC. As soon as I do that, samba_dnsupdate  
works on the secondary. When I change it back to use the local Samba as  
resolver, it no longer works.

So it is a DNS issue (possibly related to replication problems? I don't know.)

Anyway, this works. On to the next step.

Thanks a lot!

Roel


> >-----Oorspronkelijk bericht-----
> >Van: samba [mailto:samba-bounces at lists.samba.org] Namens Roel van Meer
> >Verzonden: donderdag 6 augustus 2015 9:28
> >Aan: samba at lists.samba.org
> >Onderwerp: Re: [Samba] 2nd DC, internal DNS:
> >dns_tkey_negotiategss: TKEY is unacceptable
> >
> >L.P.H. van Belle writes:
> >
> >> check the rights on :
> >> /var/lib/samba/private/dns.keytab 640 root:bind
> >> /var/lib/samba/private/dns 750 root:bind
> >> /var/lib/samba/private/sam.ldb.d 750 root:bind
> >
> >I'm using the internal DNS on both DC's, so I guess bind
> >access rights
> >aren't the issue.
> >
> >Thanks for your answer though :)
> >
> >Regards,
> >
> >Roel
> >
> >
> >> >-----Oorspronkelijk bericht-----
> >> >Van: samba [mailto:samba-bounces at lists.samba.org] Namens
> >Roel van Meer
> >> >Verzonden: donderdag 6 augustus 2015 8:55
> >> >Aan: samba at lists.samba.org
> >> >Onderwerp: [Samba] 2nd DC, internal DNS:
> >> >dns_tkey_negotiategss: TKEY is unacceptable
> >> >
> >> >Hi everyone,
> >> >
> >> >I'm testing with a Samba4 AD network, and I have some problems
> >> >with DNS on
> >> >the second DC, with which I could use a bit of your help.
> >> >
> >> >I have an AD with two DC's, both Samba 4.2.3.  On the first DC,
> >> >samba_dnsupdate works fine.  With stock 4.2.3 I get the error
> >> >
> >> >  "TSIG error with server: tsig verify failure"
> >> >
> >> >but the DNS updates succeed anyway, and after applying Gunther
> >> >Kukkukk's patch from
> >> >https://lists.samba.org/archive/samba-technical/2013-February/0
> >> 90408.html
> >> >the error is gone.  So no problems there.
> >> >
> >> >However, on the second DC samba_dnsupdate does not work.  I
> >> >get the error
> >> >
> >> >  "dns_tkey_negotiategss: TKEY is unacceptable"
> >> >
> >> >Problem is: I don't really know where to look.  On the first
> >> >DC (dev), the
> >> >ticket cache used by samba_dnsupdate contains:
> >> >
> >> >  root at dev:~# klist -c /tmp/tmpoFYYga
> >> >  Ticket cache: FILE:/tmp/tmpoFYYga
> >> >  Default principal: DEV$@EXAM.CORP
> >> >
> >> >  Valid starting       Expires              Service principal
> >> >  08/06/2015 08:17:43  08/06/2015 18:17:43
> >krbtgt/EXAM.CORP at EXAM.CORP
> >> >  08/06/2015 08:17:43  08/06/2015 18:17:43
> >DNS/dev.exam.corp at EXAM.CORP
> >> >
> >> >On the second DC (dc2) the ticket cache looks like:
> >> >
> >> >  root at dc2:~# klist -c /tmp/tmpzCc55h
> >> >  Ticket cache: FILE:/tmp/tmpzCc55h
> >> >  Default principal: DC2$@EXAM.CORP
> >> >
> >> >  Valid starting       Expires              Service principal
> >> >  08/06/2015 08:18:29  08/06/2015 18:18:29
> >krbtgt/EXAM.CORP at EXAM.CORP
> >> >  08/06/2015 08:18:29  08/06/2015 18:18:29
> >DNS/dev.exam.corp at EXAM.CORP
> >> >
> >> >which smells incorrect, because it has a service principal for
> >> >dev.exam.corp
> >> >instead of dc2.exam.corp?
> >> >
> >> >The file /etc/krb5.conf looks like this on both servers:
> >> >
> >> >  [libdefaults]
> >> >        default_realm = EXAM.CORP
> >> >        dns_lookup_realm = false
> >> >        dns_lookup_kdc = false
> >> >
> >> >
> >> >Could anyone please give me a hint on where to look further,
> >> >or which docs
> >> >to read to get this working?
> >> >
> >> >Thanks a lot,
> >> >
> >> >Roel
> >> >
> >> >--
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> >> >
> >> >
> >>
> >>
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>
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