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: 20.01.2019 @ 08:28
Script: /board.php?boardid=154&page=1&daysprune=1000&sortfield=topic&sortorder=DESC&sid=3923183a483ae865245bb14e13e22aa5
Referer: