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: 23.01.2019 @ 07:11
Script: /board.php?boardid=5&sid=68df901481d6b62728e1dc9b3c27e57a
Referer: