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Asked: 2026-06-14T17:45:45+00:00

I recently developed an Android application with which the Android device can communicate with

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I recently developed an Android application with which the Android device can communicate with another Android device running the application.
The communication works over sockets, therefore I developed a server which i run on my computer.

Here is my problem:

The communication between the devices over the Server running on my PC works fine, as long as all devices as well as the PC are in the same LAN (connected over the same Router for example).

Now I want to get the server online, so that the Android devices can connect to the “online” server and communicate with each other over the server from anywhere.

I simply have no idea of how to get the server online and running. How can I do that?

The main issue is, that I know about Client/Server communication locally, but have no experience in the “online” sector.

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1 Answer

  1. Editorial Team

    It is more a network problem than a programming one. Your server open a socket and therefore is available to anyone able to reach that socket.

    You have to do a redirection on your router. The problem is that your machine doesn’t have a public IP, only your router has one. So when your router receive a packet on port 21 for example, it doesn’t know what to do with it. You have to configure it to say “the port 21 has to redirected to the local IP XXX”

    Also the public IP of your modem/router can change, depending on your ISP. If your have a fixed IP, it won’t change, otherwise you will have to install a software like dyndns to have a domain name associated with your IP.

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