The issue I am facing:
I've used pihole for years as DNS filter. Since last upgrade, when a host make a lot of dns queries in the unit time, after a while he gets "REFUSED" when trying to resolve.
My problem is that the host is an http proxy server with ~ 2000 clients and so it has to do tons of DNS queries: this problems occurs only since last update:
Details about my system:
The host providing DNS filtering is an ubuntu 18.04.
Thanks in advance for any help: I really need it to get back working!
What I have changed since installing Pi-hole:
Nothing, just upgraded.