[Samba] DNS not exactly fixed

[Dr. Lars Hanke]

After deletion and recreation of the reverse zone Bind9 started again. 
Thanks to Rowland for the hint. However, bind complains that virtually 
all zones are duplicate and thus at least one issue is ignored. Since 
it's samba_dlz complaining there's either something wrong in the AD or 
in the DLZ module. The Bind does not have any other zones than the DLZ.

I have trouble connecting windows clients to my AD after the secondary 
DC took over. But as far as I can tell DNS works flawlessly.

Oct 28 07:07:46 verdandi named[672]: sizing zone task pool based on 22 zones
Oct 28 07:07:46 verdandi named[672]: Loading 'AD Zones' using driver dlopen
Oct 28 07:07:46 verdandi named[672]: samba_dlz: starting configure
Oct 28 07:07:46 verdandi named[672]: samba_dlz: Ignoring duplicate zone 
'1.16.172.in-addr.arpa' from 
'DC=@,DC=1.16.172.in-addr.arpa,CN=MicrosoftDNS,DC=DomainDnsZones,DC=ad,DC=microsult,DC=de'
Oct 28 07:07:46 verdandi named[672]: samba_dlz: Ignoring duplicate zone 
'6.16.172.in-addr.arpa' from 
'DC=@,DC=6.16.172.in-addr.arpa,CN=MicrosoftDNS,DC=DomainDnsZones,DC=ad,DC=microsult,DC=de'
Oct 28 07:07:46 verdandi named[672]: samba_dlz: Ignoring duplicate zone 
'ad.microsult.de' from 
'DC=@,DC=ad.microsult.de,CN=MicrosoftDNS,DC=DomainDnsZones,DC=ad,DC=microsult,DC=de'
Oct 28 07:07:46 verdandi named[672]: samba_dlz: Ignoring duplicate zone 
'10.16.172.in-addr.arpa' from 
'DC=@,DC=10.16.172.in-addr.arpa,CN=MicrosoftDNS,DC=ForestDnsZones,DC=ad,DC=microsult,DC=de'
Oct 28 07:07:46 verdandi named[672]: samba_dlz: Ignoring duplicate zone 
'_msdcs.ad.microsult.de' from 
'DC=@,DC=_msdcs.ad.microsult.de,CN=MicrosoftDNS,DC=ForestDnsZones,DC=ad,DC=microsult,DC=de'

Any idea what could lead to these messages?