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 @ 16:39
Script: /formmail.php?userid=55&sid=971086c1170d035ddf03486c98260139
Referer: