mysqli_connect(): (HY000/2002): No route to host

in /var/www/kiddoware-backend/jetfw2/db/dbms/mysql.php on line 86. Level-type-code: 2

Warning: mysqli_close() expects parameter 1 to be mysqli, null given in /var/www/kiddoware-backend/jetfw2/db/dbms/mysql.php on line 193