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: 22.01.2019 @ 21:30
Script: /usercp.php?action=addsubscription&boardid=54&sid=19421cc934ed78adcab40afd08d36c06
Referer: