Error connecting to database - check your database connection properties in the constants.php file!

SQLSTATE[HY000] [2002] Connection refused
PHP Version : 7.4.33

Warning: PDO::prepare(): SQLSTATE[00000]: No error: PDO constructor was not called in /var/www/html/public_html/mi/dev/admin/includes/Session.php on line 521

Fatal error: Uncaught Error: Call to a member function execute() on null in /var/www/html/public_html/mi/dev/admin/includes/Session.php:522 Stack trace: #0 /var/www/html/public_html/mi/dev/admin/includes/Session.php(59): Session->addActiveGuest() #1 /var/www/html/public_html/mi/dev/admin/includes/Session.php(26): Session->startSession() #2 /var/www/html/public_html/mi/dev/admin/includes/controller.php(28): Session->__construct() #3 /var/www/html/public_html/mi/dev/index.php(1): include('/var/www/html/p...') #4 {main} thrown in /var/www/html/public_html/mi/dev/admin/includes/Session.php on line 522