[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_mysqli.php:76
#3: CDatabase->ForSql(string)
	/home/bitrix/www/bitrix/modules/iblock/classes/general/iblocksection.php:2238
#4: CAllIBlockSection::_check_rights_sql(string, NULL)
	/home/bitrix/www/bitrix/modules/iblock/classes/mysql/iblocksection.php:73
#5: CIBlockSection::GetList(array, array, boolean, array)
	/home/bitrix/www/bitrix/php_interface/avt_functions.php:87
#6: require_once(string)
	/home/bitrix/www/bitrix/php_interface/init.php:255
#7: include_once(string)
	/home/bitrix/www/bitrix/modules/main/include.php:125
#8: require_once(string)
	/home/bitrix/www/bitrix/modules/main/include/prolog_before.php:14
#9: require_once(string)
	/home/bitrix/www/bitrix/modules/main/include/prolog.php:10
#10: require_once(string)
	/home/bitrix/www/bitrix/header.php:4
#11: require(string)
	/home/bitrix/www/catalog/index.php:1
#12: include_once(string)
	/home/bitrix/www/bitrix/modules/main/include/urlrewrite.php:174
#13: include_once(string)
	/home/bitrix/www/bitrix/urlrewrite.php:2
----------