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: 22.01.2019 @ 22:55
Script: /board.php?boardid=6&sid=6ad79774628e3ed56b47f354dbfd3655
Referer: