How to fix "Error establishing a database connection" in WordPress

In this tutorial, we'll talk about one of the most common errors which can be encountered with Wordpress website and the ways to fix it.
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How to fix "Error establishing a database connection": https://www.namecheap.com/support/knowledgebase/article.aspx/9663/2187/how-to-fix-error-establishing-a-database-connection-in-wordpress/

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