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 @ 00:35
Script: /board.php?boardid=187&daysprune=1000&sortfield=lastposttime&sortorder=DESC&sid=8375208ffbf15e127e1ea28e07e7912b&page=2
Referer: