[Pdns-users] Zone transfert rejected in Powerdns Letsencrypt challenge

Brian Candler b.candler at pobox.com
Wed Jun 23 08:25:53 UTC 2021

On 23/06/2021 08:54, Cheikh Dieng wrote:
> Very Thanks,
> It's clear for me. For dnsdist i  need HA pour my Powerdns.
And how are you achieving HA of your dnsdist?

The normal, recommended approach for authoritative DNS resilience is to 
have multiple nameservers, listed as separate NS records. dnsdist is 
best deployed in special situations, such as the need to preprocess 
requests and send them to different destinations.

There's not a problem deploying dnsdist as such: it's just adding 
unnecessary complexity, and is an additional layer to manage and debug.

> >>The delegation is done at the parent level, yes. However the 
> delegated domain still needs to contain NS records and a SOA record 
> for its own zone:
>     Yes, this is some details
>     ...
>     cloud.lfpw.dsna.fr <http://cloud.lfpw.dsna.fr>      3600    IN    
>      NS ns.cloud.lfpw.dsna.fr <http://ns.cloud.lfpw.dsna.fr>.

(1) That NS record disagrees with the delegation NS records. They need 
to match.

(2) As far as I can see, you don't have any A record for 
"ns.cloud.lfpw.dsna.fr" in your "cloud.lfpw.dsna.fr" zone, which means 
your NS record won't resolve.

But there are worse problems.

Firstly, lfpw.dsns.fr and cloud.lfpw.dsna.fr are both delegated to 
"vitre.cena.fr." but that nameserver does not answer to either of those 
domains.  Either contact that nameserver operator and get them to fix it 
- or change your delegation so you don't use that nameserver.

Secondly, cloud.lfpw.dsna.fr is delegated to vip-in.cloud.lfpw.dsna.fr, 
which has a glue record address of  (Glue records are 
used when the nameserver's name is inside the domain being delegated: 
that is, the nameserver vip-in.cloud.lfpw.dsna.fr is within 

However that nameserver does not respond:

$ dig +norec @ cloud.lfpw.dsna.fr. soa

; <<>> DiG 9.10.6 <<>> +norec @ cloud.lfpw.dsna.fr. soa
; (1 server found)
;; global options: +cmd

;; connection timed out; no servers could be reached

If you delegate a domain to two nameservers, and both of those 
nameservers are not responding, then your domain is completely broken.  
You must fix at least one of those problems for it to start working; and 
preferably fix both of those problems to have some resilience.

I think I will drop out of this thread now.  I've tried to explain the 
problem three times, and it seems my explanations are not clear enough, 
so I will let someone else try.  Also, this isn't really a powerDNS 
question, but more one of understanding DNS in general.



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