[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/mysqlcommonconnection.php:98
#1: Bitrix\Main\DB\MysqlCommonConnection->getTableFields(string)
	/home/bitrix/www/bitrix/modules/main/lib/db/sqlhelper.php:304
#2: Bitrix\Main\DB\SqlHelper->prepareInsert(string, array)
	/home/bitrix/www/bitrix/modules/main/lib/db/mysqlcommonsqlhelper.php:482
#3: Bitrix\Main\DB\MysqlCommonSqlHelper->prepareMerge(string, array, array, array)
	/home/bitrix/www/bitrix/modules/main/lib/config/option.php:267
#4: Bitrix\Main\Config\Option::set(string, string, string, string)
	/home/bitrix/www/bitrix/modules/main/classes/general/option.php:42
#5: CAllOption::SetOptionString(string, string, string)
	/home/bitrix/www/bitrix/php_interface/init.php:2
#6: include_once(string)
	/home/bitrix/www/bitrix/modules/main/include.php:139
#7: require_once(string)
	/home/bitrix/www/bitrix/modules/main/include/prolog_before.php:14
#8: require_once(string)
	/home/bitrix/www/bitrix/modules/main/include/prolog.php:10
#9: require_once(string)
	/home/bitrix/www/bitrix/header.php:1
#10: require(string)
	/home/bitrix/www/sanitary/index.php:2
#11: include_once(string)
	/home/bitrix/www/bitrix/modules/main/include/urlrewrite.php:159
#12: include_once(string)
	/home/bitrix/www/bitrix/urlrewrite.php:2