title: netbeans IDE 8.1 "Unable to connect to the Plugin Portal because of Connection reset"
body: <p>Can't install any plugin in netbeans ide 8.1.</p>
  <p>I get the following error:</p>
  <blockquote>
  <p>Unable to connect to the Plugin Portal because of Connection reset</p>
  <p>Check your proxy settings or try again later. The server may be unavailable at the moment. You may also want to make sure that your
  firewall is not blocking network traffic.</p>
  </blockquote>
  <p>Or when run Check for updates:</p>
  <blockquote>
  <p>Unable to connect to the Plugin Portal because of Connection reset</p>
  </blockquote>
  <p>Already tried:</p>
  <ol>
  <li>Turn off the fire wall</li>
  <li>Add the option &quot;-J-Djava.net.preferIPv4Stack=true&quot; to the netbeans_default_options in &quot;\NetBeans 8.1\etc\netbeans.conf&quot;</li>
  <li>Run netbeans as System Administrator</li>
  </ol>
  <p>What can i do?
  Please help</p>