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 @ 12:22
Script: /board.php?boardid=39&sid=b561f1cfe05f86add930f03e6de719b8
Referer: