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: 20.01.2019 @ 08:05
Script: /index.php?sid=b7e5f6d4fe6557ca7470db162222f0b3
Referer: