Ошибка базы данных

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Warning: mysqli_connect(): (HY000/2002): Connection refused in /home/admin/web/articles2.freelancersjob.net/public_html/includes/classes/Db.php on line 16

Warning: mysqli_query() expects parameter 1 to be mysqli, bool given in /home/admin/web/articles2.freelancersjob.net/public_html/includes/classes/Db.php on line 17

Warning: mysqli_query() expects parameter 1 to be mysqli, bool given in /home/admin/web/articles2.freelancersjob.net/public_html/includes/classes/Db.php on line 22

Warning: mysqli_error() expects parameter 1 to be mysqli, bool given in /home/admin/web/articles2.freelancersjob.net/public_html/includes/classes/Db.php on line 22