Macos: cannot do recursive NS lookups

[Ondřej Surý]

Hi Mark,

this looks like something is intercepting DNS on your system and/or network.

Ondrej
--
Ondřej Surý (He/Him)
ondrej at isc.org

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> On 5. 5. 2026, at 17:56, Mark Strohm <markdstrohm at gmail.com> wrote:
> 
> After recent updates on my Macos systems, bind can no longer do recursive NS lookups.  dig returns SERVFAIL.  Any help would be much appreciated.
> 
> This is happening for different versions of bind and different Macos versions.
> 
> Here are log entries from a Homebrew install of 9.20.22 on Darwin x86_64 24.6.0:
> 
> 05-May-2026 08:12:17.869 resolver: notice: DNS format error from 51.75.79.143#53 resolving isc.org/NS for 127.0.0.1#53629: non-improving referral
> 05-May-2026 08:12:17.869 lame-servers: info: FORMERR resolving 'isc.org/NS/IN': 51.75.79.143#53
> 
> 05-May-2026 08:14:28.659 resolver: notice: DNS format error from 193.0.14.129#53 resolving ./NS for <unknown>: non-improving referral
> 05-May-2026 08:14:28.659 lame-servers: info: FORMERR resolving './NS/IN': 193.0.14.129#53
> 05-May-2026 08:14:28.659 resolver: notice: resolver priming query complete: SERVFAIL
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