error 503 - after switching to ngix-varnish-apache-php--fpm

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My site worked fine and when i switched to Nginx & Varnish & Apache it gaves me 503 error. Switching back to apache only - works fine.
Here is the error log file:

[Wed Jul 20 22:49:42.601750 2022] [proxy_fcgi:error] [pid 11099:tid 140548803372800] [client 207.46.13.48:60992] AH01079: failed to make connection to backend: httpd-UDS
[Wed Jul 20 22:49:51.770579 2022] [proxy:error] [pid 11099:tid 140548786587392] (2)No such file or directory: AH02454: FCGI: attempt to connect to Unix domain socket /opt/alt/php-fpm74/usr/var/sockets/pagagal.sock (*) failed

Any ideas ?