FreeBSD's bundled unbound answers SERVFAIL

Wolfgang Zenker zenker at
Thu Feb 20 15:59:22 UTC 2020


On Thu, Feb 20, 2020 at 03:44:03PM +0100, Ralph Dolmans via Unbound-users wrote:
> This sound like the name server you are forwarding to is unreachable
> sometimes, and marked in Unbound as such. Unbound stores this
> information in its infra cache, the TTL for this cache is 15 minutes by
> default.

> Besides looking into the issue of the unreachable upstream, you could
> consider lowering the infra cache TTL using infra-host-ttl. Flushing the
> infra cache using unbound-control flush_infra should also make it work
> again.

this sounds very likely, thanks a lot. I'll try reducing infra-host-ttl.

Wolfgang Zenker
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