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: 18.01.2019 @ 08:54
Script: /board.php?boardid=4&sid=5bf291d2865a534191da129d943fa4f9
Referer: