Error creating database connection

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This means that the information about the user name and the password in your config file is not correct.
Or we can not reach the database server on sql599.your-server.de.
The database server of your hosting might be down.

Please try the following:

• Make sure the database server is running.
• Make sure the database config file exists.

And check your config file: core.config-db.php

• Make sure that the username and password are correct?
• Make sure you entered the correct driver?
• Make sure you entered the correct hostname?
• Make sure you entered the correct port?
• Make sure you entered the correct name?