Why Does My PHP Application Get 'Authentication Method Unknown to the Client' Error When Connecting to MySQL 8.0 ?

Authentication Method Error in PHP with MySQL 8.0

Users may encounter the error "The server requested authentication method unknown to the client" when attempting to establish a connection between PHP and MySQL version 8.0 .

Root Cause

This error typically occurs due to a mismatch between the authentication plugin configured in MySQL and the expectations of the PHP application. In MySQL 8, the default authentication plugin is 'auth_socket,' which assumes that applications will utilize a UNIX socket connection with no password-based authentication.

Resolution

To resolve this issue, you can alter the authentication plugin for specific users or the entire MySQL server. Here's how to modify it for the 'root' user:

1. Log in to MySQL as the 'root' user.
2. Execute the following SQL command:

ALTER USER 'root'@'localhost' IDENTIFIED WITH mysql_native_password
BY 'password';

Explanation

This command alters the authentication method for the 'root' user on 'localhost' to 'mysql_native_password.' Replace 'password' with your desired password. Additionally, you can specify the user or host that your PHP application connects to if it differs from the 'root'@'localhost' combination.

Additional Information

If your application connects to the database using a non-root user, modify the 'root' user in the SQL command with the appropriate user. Ensure that the user exists and has the necessary permissions to access the database.

Refer to the Digital Ocean documentation on Installing MySQL for further details on configuring authentication methods.

The above is the detailed content of Why Does My PHP Application Get 'Authentication Method Unknown to the Client' Error When Connecting to MySQL 8.0 ?. For more information, please follow other related articles on the PHP Chinese website!