[Bitrix\Main\DB\ConnectionException] 
Mysql connect error [localhost]: (2002) Connection refused (400)
/srv/www/rkm-electro.ru/htdocs/bitrix/modules/main/lib/db/mysqliconnection.php:65
#0: Bitrix\Main\DB\MysqliConnection->connectInternal()
	/srv/www/rkm-electro.ru/htdocs/bitrix/modules/main/lib/db/mysqliconnection.php:122
#1: Bitrix\Main\DB\MysqliConnection->queryInternal(string, array, NULL)
	/srv/www/rkm-electro.ru/htdocs/bitrix/modules/main/lib/db/connection.php:329
#2: Bitrix\Main\DB\Connection->query(string)
	/srv/www/rkm-electro.ru/htdocs/bitrix/modules/main/lib/eventmanager.php:242
#3: Bitrix\Main\EventManager->loadEventHandlers()
	/srv/www/rkm-electro.ru/htdocs/bitrix/modules/main/lib/eventmanager.php:340
#4: Bitrix\Main\EventManager->findEventHandlers(string, string)
	/srv/www/rkm-electro.ru/htdocs/bitrix/modules/main/classes/general/module.php:340
#5: GetModuleEvents(string, string, boolean)
	/srv/www/rkm-electro.ru/htdocs/bitrix/modules/main/include.php:279
#6: require_once(string)
	/srv/www/rkm-electro.ru/htdocs/bitrix/modules/main/include/prolog_before.php:14
#7: require_once(string)
	/srv/www/rkm-electro.ru/htdocs/bitrix/modules/main/include/prolog.php:10
#8: require_once(string)
	/srv/www/rkm-electro.ru/htdocs/bitrix/header.php:1
#9: require(string)
	/srv/www/rkm-electro.ru/htdocs/catalog/index.php:1
#10: include_once(string)
	/srv/www/rkm-electro.ru/htdocs/bitrix/modules/main/include/urlrewrite.php:159
#11: include_once(string)
	/srv/www/rkm-electro.ru/htdocs/bitrix/urlrewrite.php:2