Скачать или смотреть Solving the Can't Connect to the Remote MySQL Server via 3306 Port Issue

This guide addresses the common issue of connecting to a remote MySQL server via the 3306 port, detailing troubleshooting steps and solutions to get back online.
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This video is based on the question https://stackoverflow.com/q/62690323/ asked by the user 'Nick' ( https://stackoverflow.com/u/13809769/ ) and on the answer https://stackoverflow.com/a/62693202/ provided by the user 'Nicholas An' ( https://stackoverflow.com/u/9820869/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Resolving the Can't Connect to the Remote MySQL Server via 3306 Port Issue

Having trouble connecting to your remote MySQL server? You're not alone! One common issue many users face is the inability to connect despite having configured everything correctly. Let's break down the potential pitfalls and provide a comprehensive solution to this frustrating problem.

Understanding the Connection Issue

When you receive an error like this:

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it indicates that your connection attempt to the MySQL server is being refused. You've already done some troubleshooting, including changing the bind address and confirming that port 3306 is active. However, the problem persists. Here’s what to check further.

Steps to Troubleshoot

Check Local and Remote Ports:

You've already confirmed that port 3306 is open on the MySQL server by running netstat and using nmap. However, ensure that it’s listening on all interfaces by checking for 0.0.0.0:3306 in the output.

Firewall Settings:

Even if you've allowed port 3306 through the Uncomplicated Firewall (UFW), there could be additional firewall rules that need to be configured. This is often overlooked, especially if you're using other firewall management tools.

Firewalld Configuration:

If you're using firewalld, you will need to allow traffic on port 3306 explicitly. Here's how:

Proper Firewall Configuration

Installing Firewalld (if not already installed)

Make sure firewalld is installed on your system. You can install it using your package manager:

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Steps to Allow MySQL Port

Once firewalld is installed, follow these steps to configure it to allow connections through port 3306:

Start the Firewalld Service:

[[See Video to Reveal this Text or Code Snippet]]

Allow Port 3306:
Use the following command to open port 3306 permanently:

[[See Video to Reveal this Text or Code Snippet]]

Reload Firewalld:
Apply the changes by reloading the firewall configuration:

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Verify Firewall Rules:
Check that the port is properly opened:

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Look for 3306/tcp under the ports section.

Conclusion

By following the steps outlined above, you should be able to resolve the connection issue with your remote MySQL server. Ensure that both UFW and firewalld settings are correctly applied and restart any services necessary. Connectivity has multiple layers, so verifying each step is crucial in achieving a successful connection.

If you continue to experience issues after this, consider checking your networking settings or any additional security tools that may be affecting connectivity. Happy coding!