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I am trying to set up a simple listener program on my server to listen for requests on a certain port number, e.g. port 1234.

When running, my app starts up and listens on the port number, I can use a browser and get a response of success when I browse to the server IP address and chosen port.

However when I try and browse to this outside of the server I do not get a response. I am assuming that this is a firewall issue, however I have set up a firewall inbound rule and this has had no affect.

I have run netstat -a -n and my port is showing as listening, with the local address starting 0.0.0.0:1234.

My networking knowledge is very poor, any help?

  • You are correct, it is a firewall issue. Re-examine your rules and make sure no additional security programs on the server are blocking it. – Appleoddity Jul 24 '17 at 5:07
  • Another thought would be to post a screenshot of the firewall rule or details of what rule you created. – Appleoddity Jul 24 '17 at 5:08
  • After speaking with the AWS guys, it seems I needed to add a security group to my instance. Adding this has fixed the issue. – user3284707 Jul 24 '17 at 20:10
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After speaking with the AWS support team, it seems I needed to add a security group to my instance vm. Adding this has fixed the issue

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