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=2049

Information:

error message: Connecting to MySQL server 'localhost' failed.
error code: 2049
sql type: MySQLDatabase
sql error: Connection using old (pre-4.1.1) authentication protocol refused (client option 'secure_auth' enabled)
sql error number: 2049
sql version:
file: /var/www/vhosts/web39.server8.configcenter.info/httpdocs/beta.diefalschenleute.de/wcf/lib/system/database/MySQLDatabase.class.php (29)
php version: 5.2.17
wcf version: 1.0.8
date: Fri, 28 Jul 2017 04:50:36 +0000
request: /index.php?page=UsersOnline&s=95636b58a1264cf7b52857d5eceb493dac69f932
referer:

Stacktrace:

#0 /var/www/vhosts/web39.server8.configcenter.info/httpdocs/beta.diefalschenleute.de/wcf/lib/system/database/Database.class.php(76): MySQLDatabase->connect()
#1 /var/www/vhosts/web39.server8.configcenter.info/httpdocs/beta.diefalschenleute.de/wcf/lib/system/WCF.class.php(270): Database->__construct(...)
#2 /var/www/vhosts/web39.server8.configcenter.info/httpdocs/beta.diefalschenleute.de/wcf/lib/system/WCF.class.php(88): WCF->initDB()
#3 /var/www/vhosts/web39.server8.configcenter.info/httpdocs/beta.diefalschenleute.de/global.php(18): WCF->__construct()
#4 /var/www/vhosts/web39.server8.configcenter.info/httpdocs/beta.diefalschenleute.de/index.php(7): require_once('/var/www/vhosts...')
#5 {main}