Fatal error: Connecting to MySQL server 'localhost' failed.

You get more information about the problem in our knowledge base: http://www.woltlab.com/help/?code=1040

Information:

error message: Connecting to MySQL server 'localhost' failed.
error code: 1040
sql type: MySQLDatabase
sql error: Too many connections
sql error number: 1040
sql version:
file: /var/www/vhosts/i111.indigo.fastwebserver.de/httpdocs/com.segger.forum/wcf/lib/system/database/MySQLDatabase.class.php (29)
php version: 5.3.3-7+squeeze19
wcf version: 1.0.11 pl 3 (Horizon)
date: Fri, 18 Aug 2017 04:59:49 +0000
request: /index.php?page=Board&boardID=3&pageNo=20&s=a232c3065a54de00c3e57ed8f1327895b902752e
referer:

Stacktrace:

#0 /var/www/vhosts/i111.indigo.fastwebserver.de/httpdocs/com.segger.forum/wcf/lib/system/database/Database.class.php(76): MySQLDatabase->connect()
#1 /var/www/vhosts/i111.indigo.fastwebserver.de/httpdocs/com.segger.forum/wcf/lib/system/WCF.class.php(270): Database->__construct(...)
#2 /var/www/vhosts/i111.indigo.fastwebserver.de/httpdocs/com.segger.forum/wcf/lib/system/WCF.class.php(88): WCF->initDB()
#3 /var/www/vhosts/i111.indigo.fastwebserver.de/httpdocs/com.segger.forum/global.php(18): WCF->__construct()
#4 /var/www/vhosts/i111.indigo.fastwebserver.de/httpdocs/com.segger.forum/index.php(7): require_once('/var/www/vhosts...')
#5 {main}