Local nodejs cannot be accessed from the external network

In the Internet era, developers often need to deploy applications to external network environments such as cloud servers to facilitate user access. However, sometimes we encounter some problems. For example, when deploying a Node.js program, it can only be accessed locally, but cannot be accessed normally from the external network. This situation can be very confusing for developers, but there is a solution.

Possible causes

First, we need to understand what may be causing this problem. In fact, several common reasons for this situation are as follows:

1. Firewall settings

It may be that your firewall or router blocks external users from accessing the port of the local service.

2. IP address problem

It may also be a problem with your server settings. You may need to change your IP address from a local IP address to a public IP address.

3. Port problem

It may also be that the port your program listens to can only be used locally. And if your program needs to run on an external network, you need to configure it to listen on a port on a public IP address.

Solution

Next we will talk about how to solve the problem of local Node.js being inaccessible from the external network through the following methods.

1. Check Firewall Settings

A firewall is an essential construct that blocks network attacks and malware intrusions. However, sometimes it can misidentify your Node.js application and block access from external networks. In this case, you should check your firewall settings to make sure they are not blocking access to your application unnecessarily.

2. Try to use a public IP address

If your server uses a dynamic IP address, you may need to find its new IP each time you restart the server. address. You can get more help by visiting your router admin panel or contacting your cloud provider. If you are using a static IP address, you must set it to a public IP address in order to access it from the outside.

3. Configure the correct listening port

Finally, make sure your Node.js application can listen on the port on the external network. You need to configure your application's port to listen on a port on a public IP address. This way, your application can be accessed on the external network.

Summary

In this article, we discussed the problem of being unable to access the external network when deploying Node.js programs, and provided possible causes and solutions. If you encounter this kind of problem, you can try to solve it by following the above methods. Don’t forget to check your firewall settings, try using a public IP address, and properly configure your application’s listening port.

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