[Bitrix\Main\DB\ConnectionException] 
Mysql connect error [localhost]: (2002) Connection refused (400)
/var/www/clients/client0/web1/web/bitrix/modules/main/lib/db/mysqliconnection.php:65
#0: Bitrix\Main\DB\MysqliConnection->connectInternal
	/var/www/clients/client0/web1/web/bitrix/modules/main/lib/data/connection.php:53
#1: Bitrix\Main\Data\Connection->getResource
	/var/www/clients/client0/web1/web/bitrix/modules/main/lib/db/mysqlisqlhelper.php:21
#2: Bitrix\Main\DB\MysqliSqlHelper->forSql
	/var/www/clients/client0/web1/web/bitrix/modules/main/lib/config/option.php:193
#3: Bitrix\Main\Config\Option::load
	/var/www/clients/client0/web1/web/bitrix/modules/main/lib/config/option.php:38
#4: Bitrix\Main\Config\Option::get
	/var/www/clients/client0/web1/web/bitrix/modules/main/lib/httprequest.php:394
#5: Bitrix\Main\HttpRequest->prepareCookie
	/var/www/clients/client0/web1/web/bitrix/modules/main/lib/httprequest.php:71
#6: Bitrix\Main\HttpRequest->__construct
	/var/www/clients/client0/web1/web/bitrix/modules/main/lib/httpapplication.php:48
#7: Bitrix\Main\HttpApplication->initializeContext
	/var/www/clients/client0/web1/web/bitrix/modules/main/lib/application.php:123
#8: Bitrix\Main\Application->initializeExtendedKernel
	/var/www/clients/client0/web1/web/bitrix/modules/main/include.php:24
#9: require_once(string)
	/var/www/clients/client0/web1/web/bitrix/modules/main/include/prolog_before.php:14
#10: require_once(string)
	/var/www/clients/client0/web1/web/bitrix/modules/main/include/prolog.php:10
#11: require_once(string)
	/var/www/clients/client0/web1/web/bitrix/header.php:1
#12: require(string)
	/var/www/clients/client0/web1/web/city/index.php:3