How to Fix the 'Server Requested Authentication Method Unknown to Client' Error in PHP with MySQL 8.0 ?

Resolving "Server Requested Authentication Method Unknown to Client" Error in PHP with MySQL 8.0

When attempting to connect to a MySQL database from PHP, an error may arise stating: "The server requested authentication method unknown to the client." This error typically pertains to an incompatible authentication plugin utilized by MySQL.

Identifying the Root Cause

MySQL 8.0 employs the "caching_sha2_password" authentication plugin by default, which conflicts with PHP applications that anticipate password-based login. Consequently, you must modify the MySQL authentication plugin to suit the authentication method expected by your PHP application.

Modifying the Authentication Plugin

To alter the authentication plugin in MySQL:

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

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

Substitute "new_password" with the desired root password. If your PHP application utilizes a non-root user, replace "root" with that specific username.

Further Resources

For additional information on this topic, refer to the comprehensive guide provided by Digital Ocean at:

https://www.digitalocean.com/community/tutorials/how-to-install-mysql-on-ubuntu-22-04-focal-fossa

By implementing these steps, you can effectively resolve the "The server requested authentication method unknown to the client" error and seamlessly establish connections between your PHP application and MySQL database.

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