SQL-DATABASE ERROR

Database error in WoltLab Burning Board (): Link-ID == false, connect failed
mysql error: Too many connections
mysql error number: 1040
mysql version: unknown
php version: 4.4.9
Date: 31.05.2023 @ 03:17
Script: /wbb2/board.php?boardid=9&sid=00e359c00a7ec66846a419e7b8ef93b3
Referer: