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

Troubleshooting MySQL Server Authentication Error in PHP with MySQL 8.0

When attempting to establish a connection between your PHP application and MySQL 8.0 , you may encounter an error indicating: "The server requested authentication method unknown to the client." This error results from a mismatch between the authentication method employed by the MySQL server and that expected by the PHP client.

Root Cause and Solution

Typically, MySQL 8.0 utilizes the 'auth_socket' authentication plugin, which does not support password-based login. To resolve this issue, you can modify the authentication plugin for the database user:

1. Connect to the MySQL server as the 'root' user.

2. Execute the following SQL command:

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

   Copy after login

   Replace 'new_password' with a secure password. If your application connects to the database using a different user, modify the 'root' username accordingly.

By switching to the 'mysql_native_password' plugin, PHP will be able to authenticate using a password, eliminating the error.

Additional information and resources on this topic are available in the Digital Ocean guide: Installing MySQL.

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