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 @ 12:12
Script: /board.php?boardid=39&sid=1e87a3303bcf71070f4a407947c37f1a
Referer: