[Bitrix\Main\DB\ConnectionException] 
Mysql connect error [localhost]: (1040) Too many connections (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:327
#2: Bitrix\Main\DB\Connection->query(string, NULL)
	/home/bitrix/www/bitrix/modules/main/lib/db/connection.php:376
#3: Bitrix\Main\DB\Connection->queryExecute(string)
	/home/bitrix/www/bitrix/php_interface/after_connect_d7.php:3
#4: include(string)
	/home/bitrix/www/bitrix/modules/main/lib/db/connection.php:1016
#5: Bitrix\Main\DB\Connection->afterConnected()
	/home/bitrix/www/bitrix/modules/main/lib/db/mysqliconnection.php:101
#6: Bitrix\Main\DB\MysqliConnection->connectInternal()
	/home/bitrix/www/bitrix/modules/main/lib/db/mysqliconnection.php:128
#7: Bitrix\Main\DB\MysqliConnection->queryInternal(string, NULL, NULL)
	/home/bitrix/www/bitrix/modules/main/lib/db/connection.php:327
#8: Bitrix\Main\DB\Connection->query(string, NULL, integer, integer)
	/home/bitrix/www/bitrix/modules/main/lib/db/connection.php:355
#9: Bitrix\Main\DB\Connection->queryScalar(string)
	/home/bitrix/www/bitrix/modules/main/lib/session/handlers/table/usersessiontable.php:100
#10: Bitrix\Main\Session\Handlers\Table\UserSessionTable::lock(string)
	/home/bitrix/www/bitrix/modules/main/lib/session/handlers/databasesessionhandler.php:50
#11: Bitrix\Main\Session\Handlers\DatabaseSessionHandler->lock(string)
	/home/bitrix/www/bitrix/modules/main/lib/session/handlers/abstractsessionhandler.php:50
#12: Bitrix\Main\Session\Handlers\AbstractSessionHandler->read(string)
	
#13: session_start()
	/home/bitrix/www/bitrix/php_interface/init.php:4
#14: include_once(string)
	/home/bitrix/www/bitrix/modules/main/include.php:125
#15: require_once(string)
	/home/bitrix/www/bitrix/modules/main/include/prolog_before.php:14
#16: require_once(string)
	/home/bitrix/www/bitrix/modules/main/include/prolog.php:10
#17: require_once(string)
	/home/bitrix/www/bitrix/header.php:1
#18: require(string)
	/home/bitrix/www/404.php:5
#19: include_once(string)
	/home/bitrix/www/bitrix/urlrewrite.php:4