How to Fix MySQL 'mysqlnd cannot connect to MySQL 4.1 using old authentication' Errors?

Resolving MySQL Connectivity Issues with Deprecated Authentication

When attempting to connect to MySQL databases hosted on platforms like bluesql.net, users may encounter the "Connect Error (2000) mysqlnd cannot connect to MySQL 4.1 using old authentication" error. This error arises due to a disparity between the authentication protocols used by older MySQL versions and newer versions, which offer support for both old and new password schemas.

To troubleshoot this issue, it's essential to determine whether the server is configured to use the old password schema by default. This can be verified by executing the SQL query "SHOW VARIABLES LIKE 'old_passwords';" from the command line or using a GUI-based MySQL management tool. If the query returns "old_passwords,Off," then existing user accounts may employ old passwords.

Confirming which authentication routine will be used can be done by examining the "mysql.user" table. Accounts with old passwords have a password length of "16," while those with new passwords have a length of "41." To set a new password, use the "SET PASSWORD FOR 'User'@'Host'=PASSWORD('yourpassword');" query, replacing "User" and "Host" with values obtained from the previous query.

Once the password is updated, execute the "FLUSH Privileges;" query. Verify the password length using the same "mysql.user" table query again; it should now be "41." This change will allow clients using mysqlnd to successfully connect to the MySQL server.

For further insights, refer to the official MySQL documentation at the following links:

• [Using Old Clients](http://dev.mysql.com/doc/refman/5.0/en/old-client.html)
• [Password Hashing](http://dev.mysql.com/doc/refman/5.0/en/password-hashing.html)
• [Setting Passwords](http://dev.mysql.com/doc/refman/5.0/en/set-password.html)

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