Config error is REFUSED every night

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Have you tried below to pinpoint?

You could create a watchdog script by creating below file:

sudo nano /root/pi-hole-watchdog.sh

Containing below:

#!/bin/bash

DOMAIN=pi-hole.net
[ ! $(dig +short @localhost $DOMAIN) >/dev/null 2>&1 ] && /usr/sbin/service pihole-FTL restart >/dev/null 2>&1

Make it executable:

sudo chmod u+x /root/pi-hole-watchdog.sh

Edit the crontab for root:

sudo crontab -e

Add below line at the bottom to schedule every minute:

* * * * * /root/pi-hole-watchdog.sh

And save/exit.
Consequences are that a considerable amount of queries will be logged in the dbase plus Pi-hole will be restarted every minute if for whatever reason the dig command cant resolve that DOMAIN.

EDIT: my initial attempt failed running inside cron.
Have tested the changes I made.

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