[Bitrix\Main\DB\ConnectionException]
Mysql connect error [localhost, 127.0.0.1]: MySQL server has gone away (400)
/home/bitrix/www/bitrix/modules/main/lib/db/mysqlconnection.php:50
#0: Bitrix\Main\DB\MysqlConnection->connectInternal()
/home/bitrix/www/bitrix/modules/main/lib/db/mysqlconnection.php:103
#1: Bitrix\Main\DB\MysqlConnection->queryInternal(string, NULL, NULL)
/home/bitrix/www/bitrix/modules/main/lib/db/connection.php:329
#2: Bitrix\Main\DB\Connection->query(string, NULL, integer, integer)
/home/bitrix/www/bitrix/modules/main/lib/db/connection.php:357
#3: Bitrix\Main\DB\Connection->queryScalar(string)
/home/bitrix/www/bitrix/modules/security/lib/session.php:111
#4: Bitrix\Security\SessionTable::lock(string, integer)
/home/bitrix/www/bitrix/modules/security/classes/general/session_db.php:52
#5: CSecuritySessionDB::read(string)
#6: session_start()
/home/bitrix/www/bitrix/modules/main/include.php:286
#7: require_once(string)
/home/bitrix/www/bitrix/modules/main/include/prolog_before.php:14
#8: require_once(string)
/home/bitrix/www/bitrix/modules/main/include/prolog.php:10
#9: require_once(string)
/home/bitrix/www/bitrix/header.php:2
#10: require(string)
/home/bitrix/www/catalog/index.php:2
#11: include_once(string)
/home/bitrix/www/bitrix/modules/main/include/urlrewrite.php:159
#12: include_once(string)
/home/bitrix/www/bitrix/urlrewrite.php:2
Fatal error: Uncaught exception 'Bitrix\Main\DB\ConnectionException' with message 'Mysql connect error [localhost, 127.0.0.1]: Connection refused' in /home/bitrix/www/bitrix/modules/main/lib/db/mysqlconnection.php:50
Stack trace:
#0 /home/bitrix/www/bitrix/modules/main/lib/db/mysqlcommonconnection.php(130): Bitrix\Main\DB\MysqlConnection->connectInternal()
#1 /home/bitrix/www/bitrix/modules/main/lib/db/connection.php(715): Bitrix\Main\DB\MysqlCommonConnection->getTableFields('b_sec_session')
#2 /home/bitrix/www/bitrix/modules/main/lib/db/sqlhelper.php(362): Bitrix\Main\DB\Connection->getTableField('b_sec_session', 'SESSION_ID')
#3 /home/bitrix/www/bitrix/modules/main/lib/entity/datamanager.php(815): Bitrix\Main\DB\SqlHelper->prepareAssignment('b_sec_session', 'SESSION_ID', 'KoJQ771DNdz9zx8...')
#4 /home/bitrix/www/bitrix/modules/security/classes/general/session_db.php(87): Bitrix\Main\Entity\DataManager::delete('KoJQ771DNdz9zx8...')
#5 [internal function]: CSecuritySessionDB::write('KoJQ771DNdz9zx8...', '')
#6 [internal f in /home/bitrix/www/bitrix/modules/main/lib/db/mysqlconnection.php on line 50