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: 17.01.2019 @ 12:42
Script: /board.php?boardid=29&page=1&daysprune=100&sortfield=topic&sortorder=ASC&sid=53699942cea8d5039ad0ca920aa54ca8
Referer: