[Bitrix\Main\DB\ConnectionException] 
Mysql connect error [localhost]: (1040) Too many connections (400)
/home/bitrix/www/bitrix/modules/main/lib/db/mysqliconnection.php:65
#0: Bitrix\Main\DB\MysqliConnection->connectInternal()
	/home/bitrix/www/bitrix/modules/main/lib/db/mysqliconnection.php:122
#1: Bitrix\Main\DB\MysqliConnection->queryInternal(string, NULL, NULL)
	/home/bitrix/www/bitrix/modules/main/lib/db/connection.php:330
#2: Bitrix\Main\DB\Connection->query(string, NULL, integer, integer)
	/home/bitrix/www/bitrix/modules/main/lib/db/connection.php:358
#3: Bitrix\Main\DB\Connection->queryScalar(string)
	/home/bitrix/www/bitrix/modules/main/lib/session/handlers/table/usersessiontable.php:100
#4: Bitrix\Main\Session\Handlers\Table\UserSessionTable::lock(string)
	/home/bitrix/www/bitrix/modules/main/lib/session/handlers/databasesessionhandler.php:50
#5: Bitrix\Main\Session\Handlers\DatabaseSessionHandler->lock(string)
	/home/bitrix/www/bitrix/modules/main/lib/session/handlers/abstractsessionhandler.php:50
#6: Bitrix\Main\Session\Handlers\AbstractSessionHandler->read(string)
	/home/bitrix/www/bitrix/modules/main/lib/session/handlers/abstractsessionhandler.php:162
#7: Bitrix\Main\Session\Handlers\AbstractSessionHandler->validateId(string)
	
#8: session_start()
	/home/bitrix/www/bitrix/modules/main/lib/session/session.php:125
#9: Bitrix\Main\Session\Session->start()
	/home/bitrix/www/bitrix/modules/main/lib/session/kernelsessionproxy.php:42
#10: Bitrix\Main\Session\KernelSessionProxy->start()
	/home/bitrix/www/bitrix/modules/main/include.php:224
#11: require_once(string)
	/home/bitrix/www/bitrix/modules/main/include/prolog_before.php:14
#12: require_once(string)
	/home/bitrix/www/bitrix/modules/main/include/prolog.php:10
#13: require_once(string)
	/home/bitrix/www/bitrix/header.php:3
#14: require(string)
	/home/bitrix/www/local/catalog/iblock_catalog.php:7
#15: include_once(string)
	/home/bitrix/www/bitrix/modules/main/include/urlrewrite.php:159
#16: include_once(string)
	/home/bitrix/www/bitrix/urlrewrite.php:2