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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:
akam muncul berikut
semua php fpm kita chmod x biar dapat dieksekusi
setelah itu restart php fpmnya