title: How to open a port on linux (Debian jessie)
body: <p>I have a process that I'm running on my local machine which is listening on TCP port 9000. I would like to consume on another computer of my network. Here is my configuration:</p>
  
  <p><strong>I would like to see it when I run <code>nmap 10.18.12.12</code></strong> but I don't know how.</p>
  
  <pre>
  nmap localhost
  
  Starting Nmap 6.47 ( http://nmap.org ) at 2015-08-20 13:49 ART
  Nmap scan report for localhost (127.0.0.1)
  Host is up (0.00037s latency).
  Other addresses for localhost (not scanned): 127.0.0.1
  Not shown: 987 closed ports
  PORT     STATE SERVICE
  21/tcp   open  ftp
  22/tcp   open  ssh
  25/tcp   open  smtp
  80/tcp   open  http
  111/tcp  open  rpcbind
  443/tcp  open  https
  631/tcp  open  ipp
  3306/tcp open  mysql
  5432/tcp open  postgresql
  8000/tcp open  http-alt
  **9000/tcp open  cslistener**
  9001/tcp open  tor-orport
  9999/tcp open  abyss
  </pre>
  
  <pre>
  
  Starting Nmap 6.47 ( http://nmap.org ) at 2015-08-20 13:45 ART
  Nmap scan report for 10.18.12.12
  Host is up (0.00073s latency).
  Not shown: 994 closed ports
  PORT     STATE SERVICE
  21/tcp   open  ftp
  22/tcp   open  ssh
  80/tcp   open  http
  111/tcp  open  rpcbind
  443/tcp  open  https
  3306/tcp open  mysql
  </pre>