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 @ 11:12
Script: /thread.php?threadid=3621&sid=170e08d6ed3763c33a7fc2e995b80f15
Referer: