After update to php 7.4 the nc showed up with Access denied Web page

I got it: Thank you Konki

Ok first I saw a other Posting:

Got an error php7.4 ist not installed.

ERROR: Module php7.4 does not exist!

sudo apt install libapache2-mod-php7.4 libapache2-mod-php

restart php and apache
systemctl restart php7.3-fpm
systemctl reload apache2