Fatal error: Connecting to MySQL server 'rdbms.strato.de' failed.

You get more information about the problem in our knowledge base: http://www.woltlab.com/help/?code=2003

Information:

error message: Connecting to MySQL server 'rdbms.strato.de' failed.
error code: 2003
sql type: MySQLDatabase
sql error: Can't connect to MySQL server on 'rdbms.webmailer.de' (146)
sql error number: 2003
sql version:
file: /mnt/web317/c3/70/51858970/htdocs/wbb3/wcf/lib/system/database/MySQLDatabase.class.php (29)
php version: 7.2.24
wcf version: 1.0.11 pl 4 (Horizon)
date: Tue, 19 Nov 2019 20:20:44 +0000
request: /
referer:

Stacktrace:

#0 /mnt/web317/c3/70/51858970/htdocs/wbb3/wcf/lib/system/database/Database.class.php(76): MySQLDatabase->connect()
#1 /mnt/web317/c3/70/51858970/htdocs/wbb3/wcf/lib/system/WCF.class.php(270): Database->__construct(...)
#2 /mnt/web317/c3/70/51858970/htdocs/wbb3/wcf/lib/system/WCF.class.php(88): WCF->initDB()
#3 /mnt/web317/c3/70/51858970/htdocs/wbb3/global.php(18): WCF->__construct()
#4 /mnt/web317/c3/70/51858970/htdocs/wbb3/index.php(7): require_once('/mnt/web317/c3/...')
#5 {main}