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I have a server that port 9901 is running a application for nodejs.
If i access the app via http://localhost:9901, the apps run successfully.
But if i access the app from external computer and using IP. e.g: http://1.2.3.4:9901. I got error server not responding.

How can i open port 9901 for public?

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  • 2
    you have to configure port forwarding on your router
    – Panther
    Mar 8, 2016 at 16:50

1 Answer 1

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You need to enable port forwarding or open the port to the public at the n/w layer(via your router or modem) plus within the O/S also. For n/w layer please refer to your modem/router user manual and reach out to your ISP(sometimes you need help from ISPs) For Ubuntu linux or at the O/S layer, you need to refer to this

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  • Assuming, of course, that application is working also on actual network interface, not only loopback - that may also be worth to verify.
    – Jacek
    Mar 8, 2016 at 16:55
  • @Jacek i can test the apps working fine from localhost:9901. is that what you mean?
    – GusDeCooL
    Mar 9, 2016 at 1:16
  • The question is rather on what interfaces/IPs is your application listening. If only on localhost - you won't access it from outside.
    – Jacek
    Mar 9, 2016 at 8:15

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