[Bitrix\Main\DB\ConnectionException] 
Mysql connect error [localhost]: (2002) Connection refused (400)
/var/www/vhosts/oilgasinform.ru/httpdocs/bitrix/modules/main/lib/db/mysqliconnection.php:65
#0: Bitrix\Main\DB\MysqliConnection->connectInternal()
	/var/www/vhosts/oilgasinform.ru/httpdocs/bitrix/modules/main/lib/db/mysqliconnection.php:122
#1: Bitrix\Main\DB\MysqliConnection->queryInternal(string, array, NULL)
	/var/www/vhosts/oilgasinform.ru/httpdocs/bitrix/modules/main/lib/db/connection.php:329
#2: Bitrix\Main\DB\Connection->query(string)
	/var/www/vhosts/oilgasinform.ru/httpdocs/bitrix/modules/main/lib/entity/query.php:1924
#3: Bitrix\Main\Entity\Query->query(string)
	/var/www/vhosts/oilgasinform.ru/httpdocs/bitrix/modules/main/lib/entity/query.php:505
#4: Bitrix\Main\Entity\Query->exec()
	/var/www/vhosts/oilgasinform.ru/httpdocs/bitrix/modules/main/lib/entity/datamanager.php:256
#5: Bitrix\Main\Entity\DataManager::getList(array)
	/var/www/vhosts/oilgasinform.ru/httpdocs/bitrix/modules/catalog/general/catalog_sku.php:144
#6: CAllCatalogSku::GetInfoByProductIBlock(integer)
	/var/www/vhosts/oilgasinform.ru/httpdocs/bitrix/modules/iblock/lib/propertyindex/facet.php:45
#7: Bitrix\Iblock\PropertyIndex\Facet->__construct(integer)
	/var/www/vhosts/oilgasinform.ru/httpdocs/bitrix/modules/iblock/lib/propertyindex/querybuilder.php:28
#8: Bitrix\Iblock\PropertyIndex\QueryBuilder->__construct(integer)
	/var/www/vhosts/oilgasinform.ru/httpdocs/bitrix/modules/iblock/classes/general/iblockelement.php:653
#9: CAllIBlockElement->MkFilter(array, array, array)
	/var/www/vhosts/oilgasinform.ru/httpdocs/bitrix/modules/iblock/classes/general/iblockelement.php:3050
#10: CAllIBlockElement->PrepareGetList(array, array, array, string, array, array, NULL, NULL, array, boolean, string, array, array, array)
	/var/www/vhosts/oilgasinform.ru/httpdocs/bitrix/modules/iblock/classes/mysql/iblockelement.php:340
#11: CIBlockElement->prepareSql(array, array, boolean, array)
	/var/www/vhosts/oilgasinform.ru/httpdocs/bitrix/modules/iblock/classes/mysql/iblockelement.php:641
#12: CIBlockElement::GetList(array, array)
	/var/www/vhosts/oilgasinform.ru/httpdocs/bitrix/php_interface/include/classes/company.php:47
#13: Tanais\Company->__construct(string)
	/var/www/vhosts/oilgasinform.ru/httpdocs/urlrewrite_ext.php:43