Dns service not running

dns service not running after updating pi-hole on raspberry 3 with
sudo PIHOLE_SKIP_OS_CHECK=true pihole -r
debian version 9.13
try to restart dns in "setting" and get:
There was a problem applying your settings.
Debugging information:
PHP error (2): fsockopen(): unable to connect to 127.0.0.1:4711 (Connection refused) in /var/www/html/admin/scripts/pi-hole/php/FTL.php:44

You should consider to move to a current OS.

Debian 9 (Stretch) has reached EOL - it's Long Term Support ended on June 30, 2022.

Consequently, we have removed Debian 9 from the list of Pi-hole's supported OSs as early as July 7th.

We then adopted our build environments to reflect related changes and removed binary compatibility by July 31st, to be rolled out with the next Pi-hole release.

Prior to that release (i.e. the current September release), on August 29th, we released an advance announcement that we now -in addition to just notifying you that Debian 9 support has stopped- would ultimately drop support altogether:

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