[Bitrix\Main\DB\ConnectionException] 
Mysql connect error [localhost, 127.0.0.1] (400)
/home/link/domains/tlink.ru/public_html/bitrix/modules/main/lib/db/mysqlconnection.php:50
#0: Bitrix\Main\DB\MysqlConnection->connectInternal()
	/home/link/domains/tlink.ru/public_html/bitrix/modules/main/lib/db/mysqlconnection.php:103
#1: Bitrix\Main\DB\MysqlConnection->queryInternal(string, array, NULL)
	/home/link/domains/tlink.ru/public_html/bitrix/modules/main/lib/db/connection.php:330
#2: Bitrix\Main\DB\Connection->query(string, NULL)
	/home/link/domains/tlink.ru/public_html/bitrix/modules/main/lib/db/connection.php:379
#3: Bitrix\Main\DB\Connection->queryExecute(string)
	/home/link/domains/tlink.ru/public_html/bitrix/php_interface/after_connect_d7.php:3
#4: include(string)
	/home/link/domains/tlink.ru/public_html/bitrix/modules/main/lib/db/connection.php:921
#5: Bitrix\Main\DB\Connection->afterConnected()
	/home/link/domains/tlink.ru/public_html/bitrix/modules/main/lib/db/mysqlconnection.php:64
#6: Bitrix\Main\DB\MysqlConnection->connectInternal()
	/home/link/domains/tlink.ru/public_html/bitrix/modules/main/lib/db/mysqlconnection.php:103
#7: Bitrix\Main\DB\MysqlConnection->queryInternal(string, NULL, NULL)
	/home/link/domains/tlink.ru/public_html/bitrix/modules/main/lib/db/connection.php:330
#8: Bitrix\Main\DB\Connection->query(string, NULL, integer, integer)
	/home/link/domains/tlink.ru/public_html/bitrix/modules/main/lib/db/connection.php:358
#9: Bitrix\Main\DB\Connection->queryScalar(string)
	/home/link/domains/tlink.ru/public_html/bitrix/modules/security/lib/session.php:115
#10: Bitrix\Security\SessionTable::lock(string, integer)
	/home/link/domains/tlink.ru/public_html/bitrix/modules/security/classes/general/session_db.php:52
#11: CSecuritySessionDB::read(string)
	
#12: session_start()
	/home/link/domains/tlink.ru/public_html/bitrix/modules/main/include.php:281
#13: require_once(string)
	/home/link/domains/tlink.ru/public_html/bitrix/modules/main/include/prolog_before.php:14
#14: require_once(string)
	/home/link/domains/tlink.ru/public_html/bitrix/modules/main/include/prolog.php:10
#15: require_once(string)
	/home/link/domains/tlink.ru/public_html/bitrix/header.php:1
#16: require(string)
	/home/link/domains/tlink.ru/public_html/soft/index.php:2
#17: include_once(string)
	/home/link/domains/tlink.ru/public_html/bitrix/modules/main/include/urlrewrite.php:159
#18: include_once(string)
	/home/link/domains/tlink.ru/public_html/bitrix/urlrewrite.php:2

( ! ) Fatal error: Uncaught exception 'Bitrix\Main\DB\ConnectionException' with message 'Mysql connect error [localhost, 127.0.0.1]' in /home/link/domains/tlink.ru/public_html/bitrix/modules/main/lib/db/mysqlconnection.php on line 50
Call Stack
#TimeMemoryFunctionLocation
10.02056057568Bitrix\Main\Diag\ExceptionHandler->handleException( ).../exceptionhandler.php:0
( ! ) Bitrix\Main\DB\ConnectionException: Mysql connect error [localhost, 127.0.0.1] in /home/link/domains/tlink.ru/public_html/bitrix/modules/main/lib/db/mysqlconnection.php on line 50
Call Stack
#TimeMemoryFunctionLocation
10.02056057568Bitrix\Main\Diag\ExceptionHandler->handleException( ).../exceptionhandler.php:0
20.02146070216session_write_close ( ).../exceptionhandler.php:0
30.02146070608CSecuritySessionDB::write( ).../exceptionhandler.php:0
40.02146071120Bitrix\Main\ORM\Data\DataManager::delete( ).../session_db.php:92