Why Can\'t I Connect to My MySQL Database Server (127.0.0.1:3306) Using MySQL Workbench?

Troubleshooting Connection Error "Cannot Connect to Database Server (mysql workbench)

Background:

When attempting to query a database using MySQL workbench, you encounter an error stating that you cannot connect to the database server at 127.0.0.1:3306. This error message suggests that potential issues may lie in MySQL's configuration, permissions, or connection settings.

Solution:

1. Check if MySQL is Running:

• Verify that the MySQL service is running on the server at 127.0.0.1 and port 3306 using the following command:

sudo service mysqld status  

2. Grant Permissions:

• The root user should have the necessary privileges to connect to MySQL from the localhost (127.0.0.1). Check the permissions by executing the following command:

GRANT ALL PRIVILEGES ON *.* TO 'root'@'localhost' IDENTIFIED BY 'PASSWORD';

3. Disable Socket Authentication:

• In Ubuntu 16.04, socket authentication may be enabled for the root user by default when no password is set. This can prevent connections from MySQL workbench. To revert to native password authentication, follow these steps:

Step a: Log in to MySQL using socket authentication:

sudo mysql -u root

Step b: Once logged in, execute the following command to enable native password authentication:

ALTER USER 'root'@'localhost' IDENTIFIED WITH mysql_native_password BY 'PASSWORD';

4. Check Password:

• Ensure that you are providing the correct password when connecting to the database. If no password has been set, use the default password (usually empty).

5. Restart MySQL:

• After making any changes to the configuration or permissions, restart the MySQL service using the following command:

sudo service mysqld stop
sudo service mysqld start

Conclusion:

By following these steps, you should be able to resolve the "Cannot Connect to Database Server" error and successfully connect to the MySQL database using MySQL workbench.

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