title: Configuration CoTurn on Ubuntu not working
body: <p>I don't get any candidates while testing my STUN &amp; TURN server (CoTurn) with Trickle ICE on a MacBook 10.12.6 using Chrome 62.0.3202.89:</p>
  
  <p><a href="https://webrtc.github.io/samples/src/content/peerconnection/trickle-ice/" rel="nofollow noreferrer">https://webrtc.github.io/samples/src/content/peerconnection/trickle-ice/</a></p>
  
  <p>with:</p>
  
  <pre><code>stun:&lt;ip-adres&gt;:3478
  turn:&lt;ip-adres&gt;:3478 [username:test]    
  </code></pre>
  
  <p>On Digital Ocean I created a droplet Ubuntu 16.04.3 x64 and installed CoTurn version 4.5.0.3 doing:</p>
  
  <pre><code>sudo apt-get update
  sudo apt-get install coturn
  </code></pre>
  
  <p>By default the firewall is inactive.    </p>
  
  <p>Next, I edited <code>sudo vi /etc/turnserver.conf</code> and give the following options:</p>
  
  <pre><code>fingerprint
  lt-cred-mech
  user=username:test
  realm=&lt;ip-adres&gt;
  listening-ip=&lt;ip-adres&gt;
  relay-ip=&lt;ip-adres&gt;
  external-ip=&lt;ip-adres&gt;
  </code></pre>
  
  <p>Next, I edit <code>sudo vi /etc/default/coturn</code> and uncomment the option:</p>
  
  <pre><code>TURNSERVER_ENABLED=1
  </code></pre>
  
  <p>Then I start the Coturn daemon:</p>
  
  <pre><code>sudo systemctl start coturn
  sudo systemctl status coturn
  </code></pre>
  
  <p>This gives the output:</p>
  
  <pre><code>● coturn.service - LSB: coturn TURN Server
     Loaded: loaded (/etc/init.d/coturn; bad; vendor preset: enabled)
     Active: active (exited) since Sat 2017-11-11 20:27:10 UTC; 52s ago
       Docs: man:systemd-sysv-generator(8)
    Process: 1386 ExecStart=/etc/init.d/coturn start (code=exited, status=0/SUCCESS)
      Tasks: 0
     Memory: 0B
        CPU: 0
  
  Nov 11 20:27:10 coturn systemd[1]: Starting LSB: coturn TURN Server...
  Nov 11 20:27:10 coturn coturn[1386]:  * coturn disabled in /etc/default/coturn turnserver
  Nov 11 20:27:10 coturn coturn[1386]:    ...done.
  Nov 11 20:27:10 coturn coturn[1386]:  * See /etc/default/coturn for instructions on enabling turnserver
  Nov 11 20:27:10 coturn coturn[1386]:    ...done.
  Nov 11 20:27:10 coturn systemd[1]: Started LSB: coturn TURN Server.
  Nov 11 20:27:53 coturn systemd[1]: Started LSB: coturn TURN Server.
  </code></pre>
  
  <p>Please help me, what is still needed here to let it work?</p>