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 @ 02:08
Script: /board.php?boardid=155&page=1&daysprune=1000&sortfield=lastposttime&sortorder=ASC&sid=4e00866a1419e7269ee8e3189b2f9f28
Referer: