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=1275

Information:

error message: Connecting to MySQL server 'localhost' failed.
error code: 1275
sql type: MySQLDatabase
sql error: Server is running in --secure-auth mode, but 'web3'@'localhost' has a password in the old format; please change the password to the new format
sql error number: 1275
sql version:
file: /var/www/web3/html/wcf/lib/system/database/MySQLDatabase.class.php (29)
php version: 5.6.33-0+deb8u1
wcf version: 1.0.11 pl 3 (Horizon)
date: Wed, 21 Feb 2018 23:09:23 +0000
request: /forum/index.php?page=User&userID=22960
referer:

Stacktrace:

#0 /var/www/web3/html/wcf/lib/system/database/Database.class.php(76): MySQLDatabase->connect()
#1 /var/www/web3/html/wcf/lib/system/WCF.class.php(270): Database->__construct(...)
#2 /var/www/web3/html/wcf/lib/system/WCF.class.php(88): WCF->initDB()
#3 /var/www/web3/html/forum/global.php(18): WCF->__construct()
#4 /var/www/web3/html/forum/index.php(7): require_once('/var/www/web3/h...')
#5 {main}