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Pesan error di log kurang lebih seperti ini:

AH02454: FCGI: attempt to connect to Unix domain socket /opt/alt/php-fpm56/usr/var/sockets/ojs.sock (*) failed
[Tue Oct 08 00:44:09.203937 2019] [proxy_fcgi:error] [pid 14501:tid 140327369266944] [client 116.206.35.8:30915] AH01079: failed to make connection to backend: httpd-UDS

Usut punya usut ternyata masalahnya di PHP-FPM. Solusinya sangat simple:

ls -l /opt/alt

akam muncul berikut

drwxr-xr-x 3 root root 4096 Aug 30 12:10 php-fpm53
drwxr-xr-x 3 root root 4096 Aug 30 12:17 php-fpm56
drwxr-xr-x 3 root root 4096 Aug 30 12:23 php-fpm70
drwxr-xr-x 3 root root 4096 Aug 30 12:30 php-fpm71
drwxr-xr-x 3 root root 4096 Aug 30 12:38 php-fpm72
drwxr-xr-x 3 root root 4096 Aug 30 12:46 php-fpm73
drwxr-xr-x 3 root root 4096 Aug 30 12:54 php-fpm74

semua php fpm kita chmod x biar dapat dieksekusi

chmod +x /opt/alt/php-fpm71 -R
chmod +x /opt/alt/php-fpm72 -R
chmod +x /opt/alt/php-fpm73 -R

setelah itu restart php fpmnya

service php-fpm71 restart
service php-fpm72 restart
service php-fpm56 restart