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Description

This error occurs when a MySQL client attempts to connect to a MySQL server that is configured to use an authentication protocol not supported by the client. It typically indicates an incompatibility between an older client version and a newer server version, or a server configured with a specific authentication method like `caching_sha2_password` that the client does not understand.

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Error Message

Client does not support authentication protocol requested by server; consider upgrading MySQL client

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Known Causes

4 known causes

⚠️

Outdated Client Software

The MySQL client application, command-line tool, or GUI you are using is an older version that predates the authentication protocol configured on the server.

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Server Using `caching_sha2_password`

The MySQL server is configured to use the `caching_sha2_password` authentication plugin (default for MySQL 8.0+), but the connecting client lacks support for it.

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Incorrect User Authentication Plugin

A specific MySQL user account is configured to use an authentication plugin (e.g., `caching_sha2_password`) that the connecting client does not recognize or support.

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Incompatible Driver/Connector

The programming language driver or connector (e.g., PHP PDO, Python `mysql-connector`) being used is too old to support the server's authentication method.

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Solutions

3 solutions available

1. Update the User's Authentication Plugin on the Server medium

Reconfigure the user account on the MySQL server to use a compatible authentication plugin.

1

Connect to your MySQL server as a user with administrative privileges (e.g., root).

mysql -u root -p

2

Identify the user account causing the error. Replace 'your_user' with the actual username.

SELECT user, host, plugin FROM mysql.user WHERE user = 'your_user';

3

Alter the user's authentication plugin. Common compatible plugins include 'mysql_native_password' or 'caching_sha2_password' (if your client supports it). If you are unsure, 'mysql_native_password' is generally the most compatible. Replace 'your_user', 'your_host' (e.g., 'localhost' or '%'), and 'your_password' with the correct values.

ALTER USER 'your_user'@'your_host' IDENTIFIED WITH mysql_native_password BY 'your_password';

4

Flush privileges to ensure the changes take effect.

FLUSH PRIVILEGES;

5

Attempt to connect again from your client application.

2. Upgrade Your MySQL Client easy

Update your client software to a version that supports the authentication protocol used by the server.

1

Determine the version of your MySQL client software. This can often be found in the client's 'About' or 'Help' menu, or by running a command like `mysql --version` or `mysqld --version` depending on your client installation.

2

Visit the official MySQL website (dev.mysql.com) and navigate to the downloads section.

3

Download the latest stable version of the MySQL client or connector libraries appropriate for your operating system and programming language.

4

Install the updated client software or libraries according to the provided instructions.

5

Restart your application or command-line session and try connecting to the MySQL server again.

3. Configure Client to Use a Specific Authentication Plugin medium

Modify your client's connection parameters to explicitly request a supported authentication method.

1

Check the documentation for your specific MySQL client or programming language connector for connection options related to authentication plugins.

2

For example, if using the `mysql` command-line client, you might be able to specify the plugin. If your client supports `mysql_native_password`, you might try to connect like this (this is a conceptual example, actual syntax may vary):

mysql -u your_user -p --default-auth=mysql_native_password

3

If you are using a programming language (e.g., Python with `mysql.connector`), you would typically pass an `auth_plugin` argument in your connection parameters:

import mysql.connector

try:
    cnx = mysql.connector.connect(
        user='your_user',
        password='your_password',
        host='your_host',
        database='your_database',
        auth_plugin='mysql_native_password'
    )
    print("Connection successful!")
except mysql.connector.Error as err:
    print(f"Error: {err}")
finally:
    if 'cnx' in locals() and cnx.is_connected():
        cnx.close()

4

Consult your client's or connector's documentation for the exact syntax and available authentication plugins.

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Related Errors

5 related errors

MySQL Error 1251: Client Auth Protocol Mismatch