Why Does MySQL 8.0 Return 'The Server Requested Authentication Method Unknown to the Client'?

Understanding "The Server Requested Authentication Method Unknown to the Client" Error

When attempting to establish a connection to a MySQL database from PHP, users may encounter the enigmatic error: "The server requested authentication method unknown to the client." This error code corresponds to SQLSTATE[HY000] and originates from MySQL versions 8.0 and above.

Reason for the Error

The root cause of this issue typically stems from a discrepancy between the authentication mechanism utilized by the MySQL database and the expectations of the client application (PHP in this case). By default, MySQL 8.0 employs the 'auth_socket' authentication plugin, while many applications anticipate authentication via a password-protected login.

Solution

To address this problem, users must modify the authentication plugin used by their MySQL database to align with the requirements of their client application. Here are the steps:

1. Access the MySQL database as the 'root' user.
2. Execute the following SQL command:

Be sure to substitute 'password' with your desired root password. If your client application connects using a different user, replace 'root' in the command with the appropriate username.

Additional Insights

Further clarification on this issue can be found in Digital Ocean's documentation on Installing MySQL: https://www.digitalocean.com/community/tutorials/how-to-install-mysql-on-ubuntu-20-04.

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