title: Django server fail silently, doesn't give response to any request
body: <p>I have a project, based on Django. We add new bunch of apps (3-4), and server don't response on any request. <strong>Log is clear</strong>. It even don't log GET/POST requests. In browser I see:</p>
  
  <pre><code>This site can’t be reached
  
  localhost refused to connect.
  </code></pre>
  
  <p>I guess, that problem in new apps, so I removed it from <code>INSTALLED_APPS</code>, but result is the same. So I tried to find problem in <code>settings.py</code>, but result is still same. </p>
  
  <p>After that, I checked my ports by <code>netstat</code> and <code>nmap</code>, and I was stunned, because port 8000 is empty.</p>
  
  <pre><code>root@artem-debian:/home/artem# nmap -sT -O localhost
  
  Starting Nmap 6.47 ( http://nmap.org ) at 2017-05-19 10:20 EEST
  Nmap scan report for localhost (127.0.0.1)
  Host is up (0.00018s latency).
  Other addresses for localhost (not scanned): 127.0.0.1
  Not shown: 994 closed ports
  PORT     STATE SERVICE
  22/tcp   open  ssh
  25/tcp   open  smtp
  111/tcp  open  rpcbind
  631/tcp  open  ipp
  902/tcp  open  iss-realsecure
  3306/tcp open  mysql
  Device type: general purpose
  Running: Linux 3.X
  OS CPE: cpe:/o:linux:linux_kernel:3
  OS details: Linux 3.7 - 3.15
  Network Distance: 0 hops
  
  OS detection performed. Please report any incorrect results at http://nmap.org/submit/ .
  Nmap done: 1 IP address (1 host up) scanned in 2.76 seconds
  </code></pre>
  
  <p>It really shocked me. My server, is running on localhost:8000, and it is empty. </p>
  
  <p>Why? How can I fix it? It is bug in application, or I changed something in my linux machine? Any help would be appreciated. Thanks!</p>