Fix WordPress Database Login

I recently updated WordPress and a few plugins, and ever since then every attempt to reach /wp-admin throws the classic “Error establishing a database connection” message. Front-end pages are also failing, so I know the issue sits squarely between WordPress and the MySQL server, not just the user credentials.

Here’s what I need from you:

• Identify the root cause of the database connection failure (wp-config settings, corrupted tables, plugin conflict, or server-side limits).
• Restore normal access to the admin dashboard and make sure the public site loads without errors.
• Provide a brief summary of the fix so I can avoid the same problem on future updates.

You’ll have full cPanel (or SSH) access, phpMyAdmin, and the most recent backup if you need to roll anything back. Once the login page works reliably and there are no database errors on any page, the job is done.