Unable to Connect to mySQL Server

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Error Number : 2002. Connection refused
Date : Tue, August 21, 2018 21:59:03
IP : 54.80.87.62
Browser : CCBot/2.0 (https://commoncrawl.org/faq/)
Referer :
PHP Version : 5.6.37
OS : Linux
Server : Apache
Server Name : www.islandinfo.mu
Script Name : /voucher/index.php