[Bitrix\Main\DB\ConnectionException] 
Mysql connect error [localhost]: (2002) Connection refused (400)
/home/bitrix/www/bitrix/modules/main/lib/db/mysqliconnection.php:82
#0: Bitrix\Main\DB\MysqliConnection->connectInternal()
	/home/bitrix/www/bitrix/modules/main/lib/data/connection.php:53
#1: Bitrix\Main\Data\Connection->getResource()
	/home/bitrix/www/bitrix/modules/main/classes/general/database.php:283
#2: CAllDatabase->DoConnect()
	/home/bitrix/www/bitrix/modules/main/classes/mysql/database.php:94
#3: CDatabaseMysql->Query(string)
	/home/bitrix/www/bitrix/modules/levpro.useragentblacklist/events/event.php:5
#4: require(string)
	/home/bitrix/www/bitrix/php_interface/init.php:821
#5: include_once(string)
	/home/bitrix/www/bitrix/modules/main/include.php:125
#6: require_once(string)
	/home/bitrix/www/bitrix/modules/main/include/prolog_before.php:14
#7: require_once(string)
	/home/bitrix/www/bitrix/modules/main/include/prolog.php:10
#8: require_once(string)
	/home/bitrix/www/bitrix/header.php:1
#9: require(string)
	/home/bitrix/www/forum/index.php:2
#10: include_once(string)
	/home/bitrix/www/bitrix/modules/main/include/urlrewrite.php:160
#11: include_once(string)
	/home/bitrix/www/bitrix/urlrewrite.php:2
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