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Editorial Team
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Asked: 2026-05-25T06:50:07+00:00

just had a question to a simple chat program i wrote in java. The

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just had a question to a simple chat program i wrote in java.
The program uses TCP to transmit simple message strings back and forth from Server/Client. And it works on all the computers on my Network. But when i sent it to a friend of mine to see if it worked from his computer it did not. So my question is: Would i need to add some specific code to allow messages from other comps from outside my network to be recieved? or is it some kind of Firewall that is preventing this?

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1 Answer

  1. Editorial Team

    Probably a firewall or a router.

    Firewall: port is not opened.

    Router: message are not forwarded to the machine which hosts your application.

    Or your application is using the internal IP and not the IP from the internet (which has to be forwarded to your internal ip)

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