The error message "Unauthenticated user with state reading from net" in MySQL typically occurs when a client connection attempts to read data from the server without first authenticating or logging in.

Here are some common reasons why this error might occur and how to resolve it:

  1. Incorrect Credentials: Double-check the credentials used by the client to connect to the MySQL server. Ensure that the username and password are correct. If you are using a MySQL client library or tool, review the connection settings to ensure they match the credentials you intend to use.

  2. User Privileges: Verify that the user attempting to connect has the necessary privileges to read data from the database. The user must have at least the SELECT privilege on the database or table from which it is trying to read data.

  3. Authentication Plugin: In MySQL 5.6.21 and later, the default authentication plugin was changed from mysql_native_password to caching_sha2_password. If your client does not support the caching_sha2_password authentication plugin, you may encounter authentication issues. To address this, you can change the authentication plugin for the user to mysql_native_password:

    ALTER USER 'username'@'hostname' IDENTIFIED WITH 'mysql_native_password' BY 'password';

    Replace 'username', 'hostname', and 'password' with the appropriate values for your case.

  4. Network Connectivity: Ensure that there are no network connectivity issues between the client and the MySQL server. Check for firewalls, network interruptions, or other factors that might be preventing the client from establishing a successful connection.

  5. Authentication Method: If you are using PHP to connect to MySQL, check that you are using the correct authentication method. For example, if you are using the mysqli extension, make sure to use the appropriate authentication method when establishing the connection.

  6. Server Configuration: Review the MySQL server's configuration (my.cnf or my.ini) for any settings that might affect authentication or client connections. Pay attention to options like skip-grant-tables, which can disable password-based authentication.

After making any necessary adjustments or corrections, try connecting to the MySQL server again and check if the error persists. If you continue to experience issues, it may be helpful to review the MySQL server's error log for more detailed information about the error. The error log can provide additional context that may help identify the root cause of the problem.

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