Unable to Connect to mySQL Server

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Error Number : 2002. Connection refused
Date : Sat, December 7, 2019 01:16:45
IP : 3.231.229.89
Browser : CCBot/2.0 (https://commoncrawl.org/faq/)
Referer :
PHP Version : 5.6.40
OS : Linux
Server : Apache
Server Name : www.islandinfo.mu
Script Name : /voucher/index.php