The special reasons for the error “Unable to connect to the database: Could not connect to MySQL in Joomla” are list below. Please have a thorough look on the below list reasons and rectify your error according.
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Please check that your database do exist. You can check the same from PhpMyAdmin.
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The Mysql database name or username or password don’t match with the configuration.php file database name or username or password.
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Check the path of the database is correct or not. For example we give localhost and some other hosting provider give IP address as database path.
Note: The above errors may occurs due to various miscellaneous reason but just the most basic reasons are listed above.