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I am running a node.js app locally and would like to make it available for demo for outside world. It is running on port 3000.

I have added node to the firewall to allow incoming connections but still it is not possible to open connection to port 3000 from outside. It works locally though (i.e. localhost:3000).

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By 'from outside', do you mean over the local network or from the Internet? For the case of a request from the Internet (i.e. behind a NAT), you may need to set up port forwarding. –  yjwong Jan 13 at 20:47
    
@yjwong from the internet. –  user3111525 Jan 14 at 1:14
    
Have you done port forwarding? –  yjwong Jan 18 at 19:28

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