Here are some possible article titles based on your provided text: Short and to the point: * MySQL Connector Upgrade: Why is Authentication Failing with 4.1-Style Passwords? * Troubleshooting MySQL

MySql Connector Upgrade Troubleshooting: Authentication with 4.1-Style Passwords

In trying to access a MySQL database from a C# application, you may encounter the error "Authentication with old password no longer supported, use 4.1 style password." This error arises due to a change in MySQL's password authentication mechanism.

Solution Implementation

You have attempted the recommended solution of setting the old_passwords session variable to 0 and updating the user's password. However, you encountered an "Access denied for user@host" error. This suggests that there may be an additional issue preventing the password update.

Hosting Configuration

Your hosting provider has modified the my.cnf configuration file to enable the use of 4.1-style passwords. This allows you to successfully connect using the mysql command-line tool.

Connector Issue

Despite the server-side changes, you continue to face this error when connecting with MySQL Connector 6.6.5 in your C# code. This indicates an incompatibility between the connector and the updated password authentication mechanism.

Alternative Solution

An alternative solution that has been found effective for this particular issue is:

1. Connect to your database using MySQL Workbench or a similar client.

2. Run the following commands:

   • SET SESSION old_passwords=0;
   • SET PASSWORD FOR my_user=PASSWORD('my_password');
   • Replace my_user with your actual username and my_password with your desired password.

3. Use the updated password when connecting from your C# code using the following connection string format:

   • "server=my_server_ip;user=my_user;database=my_db;port=3306;password=my_password;", where you replace the placeholder values with your specific settings.

By following these steps, you should be able to successfully connect to your database and authenticate with the 4.1-style password.

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