Internal server error after updatng PHP

Ubuntu Linux 18.04.4 manged by virtualmin
Nexcloud 20.0.8
PHP 7.4.16

Apache Error log:
Connection refused: AH00957: FCGI: attempt to connect to

I am not able to figure out the reason. Everything was working normally before updating the PHP modules to the latest updates.


Check the log for last 40 lines and saw the error with PHP redis module, before I was only looking last 20 lines and couldn’t find a meaningful error message.

Installed redis module again using

sudo apt-get install php7.4-redis
sudo service php7.0-fpm restart