the nginx configuration file must specify the socket port number.

// php-fpm.d/example.conf
user = nobody
group = nobody
listen = 127.0.0.1:9093 // 9093
....

corresponding nginx configuration:

location ~ \.php$ {
        fastcgi_pass 127.0.0.1:9093; // 9093
        fastcgi_index index.php;
        fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name;
        include fastcgi_params;
    }