Exception class: RuntimeException()

ERROR: Cannot connect to MySQL database.
Possible reasons:

• MySQL is not configured propertly in config.lua.
• MySQL server is not running.

SQLSTATE[HY000] [2002] Connection refused

File: /home/u355904054/domains/arenafull.com.br/public_html/system/database.php
Line: 114


Backtrace:

#0 /home/u355904054/domains/arenafull.com.br/public_html/system/init.php(125): require_once()
#1 /home/u355904054/domains/arenafull.com.br/public_html/index.php(174): require_once('/home/u35590405...')
#2 {main}