[Bitrix\Main\DB\ConnectionException] 
Mysql connect error [localhost]: (2002) Connection refused (400)
/home/bitrix/www/bitrix/modules/main/lib/db/mysqliconnection.php:65
#0: Bitrix\Main\DB\MysqliConnection->connectInternal
	/home/bitrix/www/bitrix/modules/main/lib/db/mysqliconnection.php:122
#1: Bitrix\Main\DB\MysqliConnection->queryInternal
	/home/bitrix/www/bitrix/modules/main/lib/db/connection.php:330
#2: Bitrix\Main\DB\Connection->query
	/home/bitrix/www/bitrix/modules/main/lib/modulemanager.php:20
#3: Bitrix\Main\ModuleManager::getInstalledModules
	/home/bitrix/www/bitrix/modules/main/lib/loader.php:96
#4: Bitrix\Main\Loader::includeModule
	/home/bitrix/www/bitrix/modules/main/lib/data/connectionpool.php:308
#5: Bitrix\Main\Data\ConnectionPool->createSlaveConnection
	/home/bitrix/www/bitrix/modules/main/lib/data/connectionpool.php:247
#6: Bitrix\Main\Data\ConnectionPool->getSlaveConnection
	/home/bitrix/www/bitrix/modules/main/lib/db/connection.php:318
#7: Bitrix\Main\DB\Connection->query
	/home/bitrix/www/bitrix/modules/main/lib/orm/query/query.php:3357
#8: Bitrix\Main\ORM\Query\Query->query
	/home/bitrix/www/bitrix/modules/main/lib/orm/query/query.php:825
#9: Bitrix\Main\ORM\Query\Query->exec
	/home/bitrix/www/bitrix/modules/main/lib/orm/data/datamanager.php:500
#10: Bitrix\Main\ORM\Data\DataManager::getList
	/home/bitrix/www/bitrix/modules/main/lib/orm/data/datamanager.php:361
#11: Bitrix\Main\ORM\Data\DataManager::getByPrimary
	/home/bitrix/www/bitrix/modules/main/include.php:69
#12: require_once(string)
	/home/bitrix/www/bitrix/modules/main/include/prolog_before.php:14
#13: require_once(string)
	/home/bitrix/www/bitrix/modules/main/include/prolog.php:10
#14: require_once(string)
	/home/bitrix/www/bitrix/header.php:1
#15: require(string)
	/home/bitrix/www/catalog/index.php:3
#16: include_once(string)
	/home/bitrix/www/bitrix/modules/main/include/urlrewrite.php:159
#17: include_once(string)
	/home/bitrix/www/bitrix/urlrewrite.php:2