Why Does My MySQL Client Fail to Connect and How Can I Fix the 'Client does not support authentication protocol' Error?

Error: Incompatibility Between MySQL Client and Server Authentication Protocols

When establishing a connection to a MySQL database, you may encounter the following error: "Client does not support authentication protocol requested by server; consider upgrading MySQL client." This error arises due to an incompatibility between the authentication protocol supported by your MySQL client and the one required by the server.

Investigation and Resolution

Your initial attempt to resolve the issue by granting privileges and updating the password was unsuccessful. The error you received ("ERROR 1064") indicates a syntax error in your SQL statement. The SQL statement you used, which includes "IDENTIFIED BY 'mypassword'", is not compatible with MySQL 8.0 or later.

The Solution

The root cause of the authentication protocol mismatch is that you are using an outdated version of the MySQL Connector/J library. MySQL 8 introduced a new authentication mechanism called caching_sha2_password, which is not supported in MySQL Connector/J 5.1.45 or earlier.

To resolve this issue, you need to upgrade to MySQL Connector/J 5.1.46 or higher. The latest version of the library at the time of writing is 8.0.15. You can download the latest version from the MySQL website (https://dev.mysql.com/downloads/connector/j/) or specify the desired version in your project's dependency management system (e.g., Maven or Gradle).

Once you have upgraded the MySQL Connector/J library, you should be able to establish a successful connection to the MySQL server without encountering the authentication protocol error.

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