ERROR [2] mysqli_connect(): (HY000/2002): Connection refused

  Fatal error in line 9 of file /var/lib/security/lm_portali/backoffice/inc_mysql_lib.php, PHP 7.4.33 (Linux)

This is the debug trace



Fatal error:  Uncaught Error: Call to undefined function ereg_replace() in /var/lib/security/lm_portali/backoffice/inc_error_handler.php:69
Stack trace:
#0 /var/lib/security/lm_portali/backoffice/inc_error_handler.php(83): print_debug_info()
#1 [internal function]: myErrorHandler()
#2 /var/lib/security/lm_portali/backoffice/inc_mysql_lib.php(9): mysqli_connect()
#3 /var/lib/security/lm_portali/backoffice/st_2_inc_conn.php(44): db_connect()
#4 /var/www/vhosts/lastminutecaorle.com/httpdocs/backoffice/inc_conn.php(1): include('/var/lib/securi...')
#5 /var/lib/security/lm_portali/template_oggetto.php(6): include_once('/var/www/vhosts...')
#6 /var/www/vhosts/lastminutecaorle.com/httpdocs/template_oggetto.php(1): include('/var/lib/securi...')
#7 {main}
  thrown in /var/lib/security/lm_portali/backoffice/inc_error_handler.php on line 69