BIND 9 recursive queries returning SERVFAIL for 'legit' domain

Ondřej Surý ondrej at
Wed Jun 17 16:41:23 UTC 2020

Hi Ian,

the first thing you should do is to contact the zone owner to fix their nameservers/load-balancer. The zone/domain might be “legit”, but its nameservers are violating the DNS protocol. Maybe you won’t have to maintain a list of exceptions.

If that doesn’t work, this is the configuration option you are looking for:

Ondřej Surý — ISC

> On 17 Jun 2020, at 17:22, Ian Springett <ian.springett at> wrote:
> Hi
> I have an issue with BIND 9.14.11 and recursive queries to one particular domain. DIG result is SERVFAIL and ‘bad cookie’ is logged in /var/log/messages & /var/log/
> The domain has two DNS servers behind a load balancer which is causing the bad cookie result. Would this in itself be enough to cause the SERVFAIL and if so is there a way to have exceptions for known ‘good’ domains?
> Rgds
> Ian
> Ian Springett
> Hosted Services Engineer
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