Скачать или смотреть Resolving the ERR_CONNECTION_REFUSED Issue When Connecting Your Game to a Socket Server

Learn how to troubleshoot and fix the `ERR_CONNECTION_REFUSED` error when trying to connect your game hosted on a domain to a Socket.io server.
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Resolving the ERR_CONNECTION_REFUSED Issue When Connecting Your Game to a Socket Server

If you're working with Socket.io and have run into the frustrating ERR_CONNECTION_REFUSED error while trying to connect your game hosted on a domain to your socket server, you're not alone. This is a common issue, especially for those who are new to web development and server management. Let's break down the problem and provide a comprehensive solution.

Understanding the Problem

You have a hosted domain (e.g., <my.domain.com>) that serves a game application in the browser. Additionally, you are running both an Express HTTP server and a Socket.io server on the same machine. While everything works smoothly when connecting from your HTTP server to the Socket server using localhost, you're facing issues when trying to connect from your game to the socket server remotely.

Key Components

HTTP Server: Handles HTTP requests and communicates with the socket server.

Socket Server: Manages WebSocket connections and exchanges data in real-time.

Client-Side JavaScript: Where you're attempting to establish a connection to the socket server from the game.

The error you're encountering (ERR_CONNECTION_REFUSED) typically indicates that your socket connection attempt has been denied. This is often due to incorrect address resolution or server configuration.

Troubleshooting the Solution

After deep investigation, here’s how to resolve the issue:

1. Adjust Your Socket Connection String

In your game’s JavaScript file, it seems you're attempting to connect to the socket server with io('https://localhost:8082');. However, since your client code runs in the browser, localhost resolves to the user’s machine rather than your server.

Change it to:

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

This modification ensures that your game attempts to connect to the socket server using the correct domain.

2. Check Firewall and Port Configuration

Make sure that:

The port (8082 in this case) is open on your server's firewall and listening for incoming connections.

Your socket server is correctly configured to listen on all network interfaces (0.0.0.0) instead of just localhost for external access.

3. Inspect Your NGINX Configuration

Since you mentioned using NGINX as a proxy, verify that:

There are no syntax errors in your NGINX configuration file.

Replace 127.0.0.0 with 127.0.0.1 in your NGINX configuration, if that's where the socket server is hosted. This minor mistake can lead to the refusal of connections.

4. Handle CORS Properly

Even though the initial CORS error seemed like a secondary issue, it’s important to handle Cross-Origin Resource Sharing (CORS) for your game. Ensure that your socket server is running the correct middleware to allow requests from your domain:

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

5. Restart Services

After making these changes, don’t forget to restart your server and NGINX services for the changes to take effect.

Conclusion

By adjusting your connection string, ensuring proper NGINX configuration, and handling CORS correctly, you should be able to resolve the ERR_CONNECTION_REFUSED error when connecting your game to the Socket.io server. Troubleshooting can sometimes be a tedious process, but with the right approach, you can look forward to a smoother development experience. Happy coding!