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: 23.01.2019 @ 01:00
Script: /board.php?boardid=7&daysprune=1000&sortfield=lastposttime&sortorder=DESC&sid=aec7ffd023d638317454630f603be7d3&page=5
Referer: