SQL-DATABASE ERROR

Database error in WoltLab Burning Board (): Link-ID == false, connect failed
mysql error: Host '1blu' is blocked because of many connection errors; unblock with 'mysqladmin flush-hosts'
mysql error number: 1129
mysql version: unknown
php version: 5.3.29
Date: 16.01.2019 @ 00:57
Script: /board.php?boardid=4&sid=458d416facf22ffe00b5d9a8c63e85fa
Referer: