Why is phpMyAdmin Failing to Authenticate with MySQL 8.0, and How Can I Fix It?

Troubleshooting MySQL 8.0 and phpMyAdmin Authentication Issue

When attempting to access phpMyAdmin on a system running MySQL 8.0, users may encounter the following authentication error:

#2054 - The server requested authentication method unknown to the client

This error stems from the implementation of strong passwords and the fact that phpMyAdmin may not be using the required authentication method. To resolve this issue, it is necessary to modify the preferred authentication plugin in MySQL.

Changing the Authentication Plugin

1. Log in to MySQL console: mysql -u root -pPASSWORD
2. Change the authentication plugin: ALTER USER root IDENTIFIED WITH mysql_native_password BY 'PASSWORD';

This command changes the authentication plugin for the root user to mysql_native_password. Once executed, phpMyAdmin should be able to connect using the specified password.

Additional Considerations

• If using the mysql/mysql-server Docker image, it is recommended to use the updated solution provided by the MySQL Reference Manual.
• Changing the default authentication plugin is not recommended in production environments.
• If necessary, it is possible to uncomment the default-authentication-plugin=mysql_native_password setting in /etc/my.cnf.

Workarounds

If unable to change the authentication plugin, these workarounds can be utilized:

• Use the command ALTER USER 'root'@'localhost' IDENTIFIED WITH mysql_native_password BY 'password'; with quotes (*).

By implementing these steps, users can resolve the authentication issue and successfully access phpMyAdmin on MySQL 8.0.

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