Why Am I Getting the 'Unknown Authentication Method' Error When Connecting to MySQL Remotely?

Troubleshooting Remote MySQL Connection Failure with "Unknown Authentication Method" Error

Problem Description:

When attempting to establish a remote connection to a MySQL server from a local machine, an error is encountered:

The server requested authentication method unknown to the client [mysql_old_password]

This error indicates an incompatibility between the local and remote MySQL server's authentication methods.

Potential Solution:

Assuming PHP 5.3 is being used, the issue may stem from a change in MySQL's authentication method.

Cause:

MySQL 4.1 introduced a newer, 41-byte password format. The mysqlnd library used to connect to MySQL requires this new format. Attempting to connect with the old 16-byte password format will cause the "unknown authentication method" error.

Resolution:

To resolve this issue, the password on the remote MySQL server must be updated to the 41-byte format. The following Stack Overflow thread provides guidance on how to do this: https://stackoverflow.com/a/1340538/187954.

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