Hello Chris
sorry for late reply

>> The reason for this is that Google makes a DS request for the domain before
>> each request, but the powerdns in version 4.1 gives wrong answer for unsigned
>> domains.
> 
> Indeed it does, however it does so only for DS. 8.8.8.8 is known to
> early-SERVFAIL the DS query in such a case; however it has not been
> observed to SERVFAIL for other queries for the same zone.
> 
>> In the upstream, this is fixed for version 4.2 -
>> https://github.com/PowerDNS/pdns/pull/6923.
> 
> After talking to upstream about this, it is more likely that your
> zone has other problems that make 8.8.8.8 SERVFAIL.
> Can you post a full reproduction scenario?

I could not reproduce this error today. But today I was able to find
messages about similar problems: please look at
https://groups.google.com/forum/#!topic/public-dns-discuss/jU2HcViB9zY and
https://docs.google.com/document/d/1Bn2rmuWvHzIDnLz2Ag6DSSJHFWl69ASIUzpjxBUYE5Y/edit

I think Google has changed the behavior of the resolver.

Nevertheless, I hope that powerdns in a Buster  will handle correctly
queries for DS records.

--
wbr, Andrey Lyubimets

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