If you are getting the following message; "Error establishing a database connection", this is a cPanel bug in their 11.24.x release. Below, we have outlined how to resolve this issue:

• Find the configuration file of your database driven application (normally within the /public_html folder)
• Inside the configuration file (the file maybe called things like: wp-config.php, configure.php, config.php, configuration.php, etc…), you will see something that looks like this:

  $database = "";
  $dbusername = "";
  $dbpassword = "";
  $dbhost ="localhost";

• You will need to copy the "dbusername" and "dbpassword" from this configuration file.
• Then, please login to cPanel, and click on "MySQL"
• Next, we need to scroll down to "add new user"
• Input the SAME username and password and click "add new user"
• Your site will load now without any problems.

The above will fix the issue with the database connectivity that you have been having.