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: 16.01.2019 @ 01:38
Script: /board.php?boardid=5&sid=67f327c364e1309c1fec267e707bab37
Referer: