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 @ 08:26
Script: /board.php?boardid=5&sid=9274a5afc1be71f7e72e3343200141c4
Referer: