title: Open port in linux with java application
body: <p>I've a java application that creates a socketserver in a port.
  I test my application in a windows machine, and runs correctly, but when I test it in a linux machine, the port is not listening.</p>
  
  <p>Is there any way to open a port specifically in a linux machine?</p>
  
  <p>I run 'netstat' command, and the port I use in my application doesn't appear.
  It doesn't throw any exception.
  I'm trying to connect from another machine to the application, and the connection is refused.</p>
  
  <p>Sincerely, I don't know why it doesn't run...</p>
  
  <p>help please.</p>
  
  <p>thanks,
  david</p>