[Bitrix\Main\DB\ConnectionException] 
Mysql connect error [localhost]: (2002) Connection refused (400)
/home/bitrix/www/bitrix/modules/main/lib/db/mysqliconnection.php:82
#0: Bitrix\Main\DB\MysqliConnection->connectInternal()
	/home/bitrix/www/bitrix/modules/main/lib/db/mysqliconnection.php:128
#1: Bitrix\Main\DB\MysqliConnection->queryInternal(string, array, NULL)
	/home/bitrix/www/bitrix/modules/main/lib/db/connection.php:312
#2: Bitrix\Main\DB\Connection->query(string)
	/home/bitrix/www/bitrix/modules/main/classes/general/main.php:4520
#3: CAllSite::GetCurTemplate()
	/home/bitrix/www/bitrix/modules/main/include.php:421
#4: require_once(string)
	/home/bitrix/www/bitrix/modules/main/include/prolog_before.php:14
#5: require_once(string)
	/home/bitrix/www/bitrix/modules/main/include/prolog.php:10
#6: require_once(string)
	/home/bitrix/www/bitrix/header.php:1
#7: require(string)
	/home/bitrix/www/catalog/element.php:2
#8: include_once(string)
	/home/bitrix/www/local/php_interface/urlrewrite.php:160
#9: include_once(string)
	/home/bitrix/www/bitrix/urlrewrite_custom.php:2