Here are a few potential titles, keeping in mind they should be in the form of a question: * **MySQL Connection Error: Why Does \"mysqlnd Cannot Connect\" Happen?** * **PHP and MySQL: How t

MySQL Connection Error: Resolving "mysqlnd Cannot Connect" Issue

When attempting to connect to MySQL, you may encounter the error message: "mysqlnd cannot connect to MySQL 4.1 using the old insecure authentication." This error arises due to a mismatch between the password hashing methods used by the MySQL server and the authentication mechanism employed by the PHP MySQL driver, mysqlnd.

Solution

To resolve this error, you need to update the MySQL password hashing method to the new, more secure format. This involves modifying the MySQL configuration file (my.cnf) as follows:

1. Remove or Comment Out "old_passwords = 1":
   Locate the line "old_passwords = 1" in the my.cnf file and either remove it or comment it out by placing a "#" prefix in front of it.
2. Restart MySQL:
   Restart MySQL to apply the configuration changes. This ensures that MySQL will use the new password hashing method going forward.

3. Set New Passwords for Affected Users:
   Connect to the MySQL database and run the following query to identify users with passwords in the old format:

   <code class="sql">SELECT user, Length(`Password`) FROM  `mysql`.`user`;</code>

   For each affected user, update the password using the PASSWORD() function:

   <code class="sql">UPDATE mysql.user SET Password = PASSWORD('new_password') WHERE user = 'affected_username';</code>

4. Flush Privileges:
   After updating the passwords, flush the privileges to reflect the changes:

   <code class="sql">FLUSH PRIVILEGES;</code>

Note:

• Ensure that you use a strong and secure password for your MySQL account.
• If you still encounter issues, check the PHP error log for additional details.
• Refer to the source article "How to fix 'mysqlnd cannot connect to MySQL 4.1 using old authentication' on PHP5.3" for further guidance and troubleshooting steps.

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