How to Fix 'The server requested authentication method unknown to the client' Error in MySQL 8.0 with PHP?

MySQL 8.0 Error: Resolving Authentication Inconsistencies with PHP Applications

PHP developers connecting to MySQL 8.0 databases may encounter the error "The server requested authentication method unknown to the client." This error is typically caused by the mismatch between the authentication methods used by the MySQL database and the PHP application.

Authentication Method Conflict:

MySQL 8.0 uses caching_sha2_password as its default authentication method, while many PHP applications expect to use a traditional password-based authentication. When the application attempts to connect to the database with an incorrect authentication method, the server returns the above-mentioned error.

Solution:

To resolve this issue, it is necessary to modify the authentication method used by the MySQL database to match that expected by the PHP application. This can be achieved by switching the MySQL database's authentication plugin to mysql_native_password, which supports password-based authentication.

Steps to Change Authentication Plugin:

1. Log in to MySQL as the root user:

mysql -u root -p

2. Run the following SQL command to change the authentication plugin for the root user:

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

Replace 'new_password' with a secure password of your choice.

3. If your PHP application uses a non-root user, repeat step 2 for that user, replacing 'root' with the appropriate username.
4. Restart the MySQL service for the changes to take effect.

Additional Resources:

For further information on this topic, please refer to the following resources:

• [Digital Ocean: Installing MySQL](https://www.digitalocean.com/community/tutorials/how-to-install-mysql-on-ubuntu-20-04)
• [MySQL Documentation: Default Authentication Plugin](https://dev.mysql.com/doc/refman/8.0/en/server-options.html#sysvar_default_authentication_plugin)

The above is the detailed content of How to Fix 'The server requested authentication method unknown to the client' Error in MySQL 8.0 with PHP?. For more information, please follow other related articles on the PHP Chinese website!