Fixing “Connection Failed Unknown MySQL Server Host localhost:3306:2” error

Hello Dev, if you are reading this article, chances are you are facing an issue with your MySQL database connection. If you see an error message that says “Connection Failed Unknown MySQL Server Host localhost:3306:2,” this article is for you.

What is the “Connection Failed Unknown MySQL Server Host localhost:3306:2” error?

The “Connection Failed Unknown MySQL Server Host localhost:3306:2” error is a common error that occurs when attempting to connect to a MySQL server. This error message indicates that the MySQL client is not able to connect to the MySQL server due to an unknown host or an incorrect port.

Why does the “Connection Failed Unknown MySQL Server Host localhost:3306:2” error occur?

The “Connection Failed Unknown MySQL Server Host localhost:3306:2” error can be caused by several reasons including:

How can I fix the “Connection Failed Unknown MySQL Server Host localhost:3306:2” error?

The following are the steps you can follow to fix this error:

Step 1: Check the hostname

The first thing you need to do is to check if the hostname is correct. The hostname should be set to the IP address or domain name of the MySQL server. If you are unsure about the hostname, contact the server administrator or hosting company for assistance.

Step 2: Check the port number

If the hostname is correct, then check if the port number is correct. By default, MySQL runs on port 3306. If the MySQL server is running on a different port number, you will need to specify the correct port number in your connection string.

Step 3: Check the firewall

If the hostname and port are correct, then check if a firewall is blocking the connection to the MySQL server. You can either disable the firewall or add an exception for port 3306.

Step 4: Check MySQL server status

If none of the above steps work, then check if the MySQL server is running on the specified host and port. You can check the MySQL server status by using the following command:

sudo service mysql status

If MySQL is not running, start it using the following command:

sudo service mysql start

FAQ

Q1. How do I check my MySQL server version?

You can check your MySQL server version by logging into MySQL and running the following command:

SELECT VERSION();

Q2. How do I restart MySQL server?

You can restart MySQL server by using the following command:

sudo service mysql restart

Q3. How do I connect to a MySQL server using PHP?

You can connect to a MySQL server using PHP by using the following code:

$conn = mysqli_connect("hostname", "username", "password", "database");

Q4. How do I create a new MySQL user?

You can create a new MySQL user by using the following command:

CREATE USER 'newuser'@'localhost' IDENTIFIED BY 'password';

Q5. How do I grant privileges to a MySQL user?

You can grant privileges to a MySQL user by using the following command:

GRANT ALL PRIVILEGES ON * . * TO 'newuser'@'localhost';

Conclusion

The “Connection Failed Unknown MySQL Server Host localhost:3306:2” error is a common issue that can be fixed by checking the hostname, port number, firewall, and MySQL server status. Hopefully, this article has helped you resolve this error and get back to running your MySQL database!