How Do I Fix the \'Cannot Connect to Database Server\' Error in MySQL Workbench?

Troubleshooting "Cannot Connect to Database Server" Error in MySQL Workbench

When attempting to establish a connection to a database server via MySQL Workbench, it is possible to encounter an error stating "Cannot Connect to Database Server." To resolve this issue, it is crucial to address the underlying causes.

Solution:

1. Ensure MySQL is Running: Verify that the MySQL server is functioning properly and listening on the specified port (default: 3306).
2. Check Root User Permissions: Confirm that the root user possesses the necessary permissions to connect to the server from the specified address.
3. Establish a Secure Password: Ensure that a strong password is set for the root user to prevent unauthorized access.

Specific Case for Ubuntu 16.04:

In the case of upgrading to Ubuntu 16.04, socket authentication may be enabled for the root user by default, which can lead to connection issues if no password is set. To resolve this situation, follow these steps:

1. Log into the MySQL server using socket authentication:

sudo mysql -u root

2. Revert to native password authentication:

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

Subsequently, use the specified password ('password' in this example) whenever prompted for authentication. This should resolve the connection issue.

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