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: 18.01.2019 @ 19:48
Script: /board.php?boardid=15&page=1&daysprune=100&sortfield=topic&sortorder=ASC
Referer: