PHP-FPM and Nginx Upstream Configuration
https://blog.dbrgn.ch/2013/5/25/php-fpm-connection-refused/
Applicable to #iRedMail:
i.e.,
; listen = 127.0.0.1:9999
listen = /run/php/php7.4-fpm.sock
(in /etc/php/7.4/fpm/pool.d/www.conf)
and
upstream php_workers {
# server 127.0.0.1:9999;
server unix:/run/php/php7.4-fpm.sock;
}
(in /etc/nginx/conf-available/php_fpm.conf)