[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(string, array, NULL)
	/home/bitrix/www/bitrix/modules/main/lib/db/connection.php:329
#2: Bitrix\Main\DB\Connection->query(string)
	/home/bitrix/www/bitrix/modules/main/lib/entity/query.php:1821
#3: Bitrix\Main\Entity\Query->query(string)
	/home/bitrix/www/bitrix/modules/main/lib/entity/query.php:454
#4: Bitrix\Main\Entity\Query->exec()
	/home/bitrix/www/bitrix/modules/main/lib/entity/datamanager.php:242
#5: Bitrix\Main\Entity\DataManager::getList(array)
	/home/bitrix/www/local/modules/wt.core/lib/factory/hlblockcollectionfactory.php:35
#6: Wt\Core\Factory\HLBlockCollectionFactory->getList()
	/home/bitrix/www/local/modules/wt.core/lib/factory/hlblockcollectionfactory.php:66
#7: Wt\Core\Factory\HLBlockCollectionFactory->getEntityById(integer)
	/home/bitrix/www/local/modules/wt.core/lib/factory/hlblockcollectionfactory.php:56
#8: Wt\Core\Factory\HLBlockCollectionFactory->getEntity()
	/home/bitrix/www/local/modules/lion.exchange/admin/main/submenu/provider/config.php:7
#9: include(string)
	/home/bitrix/www/local/modules/wt.core/lib/admin/sitesettingsadminpage.php:51
#10: Wt\Core\Admin\SiteSettingsAdminPage->getConfig()
	/home/bitrix/www/local/modules/wt.core/lib/admin/sitesettingsadminpage.php:82
#11: Wt\Core\Admin\SiteSettingsAdminPage->getSettings(string)
	/home/bitrix/www/local/modules/lion.exchange/lib/eventloader.php:34
#12: Lion\Exchange\EventLoader->getSettings()
	/home/bitrix/www/local/modules/lion.exchange/lib/eventloader.php:39
#13: Lion\Exchange\EventLoader->setExportEvents()
	/home/bitrix/www/local/modules/lion.exchange/include.php:27
#14: include_once(string)
	/home/bitrix/www/bitrix/modules/main/lib/loader.php:109
#15: Bitrix\Main\Loader::includeModuleInternal(string)
	/home/bitrix/www/bitrix/modules/main/lib/loader.php:96
#16: Bitrix\Main\Loader::includeModule(string)
	/home/bitrix/www/bitrix/modules/main/classes/general/module.php:261
#17: CModule::IncludeModule(string)
	/home/bitrix/www/bitrix/modules/main/classes/general/module.php:444
#18: ExecuteModuleEventEx(array)
	/home/bitrix/www/bitrix/modules/main/include.php:289
#19: require_once(string)
	/home/bitrix/www/bitrix/modules/main/include/prolog_before.php:14
#20: include(string)
	/home/bitrix/www/catalog_dir/index.php:1
#21: include_once(string)
	/home/bitrix/www/bitrix/modules/main/include/urlrewrite.php:159
#22: include_once(string)
	/home/bitrix/www/bitrix/urlrewrite.php:2