Why is My MySQL Connection Failing with the 'caching_sha2_password' Error?

Error Encountered: Authentication Plugin 'caching_sha2_password' Unsupported

In the context of database connectivity utilizing Python's MySQL connector, users may encounter an error indicating that the 'caching_sha2_password' authentication plugin is unsupported. This error typically arises when attempting to establish a connection using the mysql_native_password authentication plugin.

Cause of the Error

The root cause of this issue lies in the mismatch between the authentication plugin specified in the connection attempt and the supported plugins on the MySQL server. By default, MySQL servers may not support the 'caching_sha2_password' plugin, which is required when using the mysql_native_password plugin for user authentication.

Solution

To resolve this error, there are two possible approaches:

1. Configure the MySQL Server to Support 'caching_sha2_password' Plugin: Modify the MySQL server configuration file (my.cnf) by adding the following line:

default_authentication_plugin=caching_sha2_password

Restart the MySQL server for the changes to take effect.

2. Specify 'mysql_native_password' Authentication Plugin Explicitly: Alternatively, users can explicitly specify the mysql_native_password plugin during the connection setup. To achieve this, add the following parameter to the connect() function:

auth_plugin='mysql_native_password'

This will override the default authentication plugin and force the connection to use mysql_native_password.

By implementing either of these solutions, users can establish a successful connection to the MySQL server with the desired authentication plugin.

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