[Bitrix\Main\DB\ConnectionException] 
Mysql connect error [localhost]: (2002) Connection refused (400)
/var/www/ustkatav/data/www/ukgo.su/bitrix/modules/main/lib/db/mysqliconnection.php:65
#0: Bitrix\Main\DB\MysqliConnection->connectInternal()
	/var/www/ustkatav/data/www/ukgo.su/bitrix/modules/main/lib/db/mysqliconnection.php:122
#1: Bitrix\Main\DB\MysqliConnection->queryInternal(string, array, NULL)
	/var/www/ustkatav/data/www/ukgo.su/bitrix/modules/main/lib/db/connection.php:329
#2: Bitrix\Main\DB\Connection->query(string)
	/var/www/ustkatav/data/www/ukgo.su/bitrix/modules/main/lib/modulemanager.php:20
#3: Bitrix\Main\ModuleManager::getInstalledModules()
	/var/www/ustkatav/data/www/ukgo.su/bitrix/modules/main/lib/loader.php:77
#4: Bitrix\Main\Loader::includeModule(string)
	/var/www/ustkatav/data/www/ukgo.su/bitrix/modules/main/lib/data/connectionpool.php:308
#5: Bitrix\Main\Data\ConnectionPool->createSlaveConnection()
	/var/www/ustkatav/data/www/ukgo.su/bitrix/modules/main/lib/data/connectionpool.php:247
#6: Bitrix\Main\Data\ConnectionPool->getSlaveConnection(string)
	/var/www/ustkatav/data/www/ukgo.su/bitrix/modules/main/lib/db/connection.php:317
#7: Bitrix\Main\DB\Connection->query(string)
	/var/www/ustkatav/data/www/ukgo.su/bitrix/modules/main/lib/modulemanager.php:20
#8: Bitrix\Main\ModuleManager::getInstalledModules()
	/var/www/ustkatav/data/www/ukgo.su/bitrix/modules/main/lib/loader.php:77
#9: Bitrix\Main\Loader::includeModule(string)
	/var/www/ustkatav/data/www/ukgo.su/bitrix/modules/main/classes/general/module.php:261
#10: CModule::IncludeModule(string)
	/var/www/ustkatav/data/www/ukgo.su/bitrix/modules/main/classes/general/module.php:444
#11: ExecuteModuleEventEx(array)
	/var/www/ustkatav/data/www/ukgo.su/bitrix/modules/main/include.php:266
#12: require_once(string)
	/var/www/ustkatav/data/www/ukgo.su/bitrix/modules/main/include/prolog_before.php:14
#13: require(string)
	/var/www/ustkatav/data/www/ukgo.su/bitrix/tools/captcha.php:8