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: 17.01.2019 @ 15:48
Script: /board.php?boardid=2&sid=e880246f35d6dd4aa0c0445dc421f39e
Referer: