title: Cannot open Eclipse Marketplace Cannot install remote marketplace locations: Cannot resolve host
body: <p>I am using eclipse Kepler version and trying to install Sonar plugin from Eclipse marketplace.
  But I am getting below error</p>
  
  <blockquote>
    <p>Cannot open Eclipse Marketplace Cannot install remote marketplace
    locations: Cannot resolve host</p>
    
    <p>This is most often caused by a problem with your internet connection.
    Please check your internet connection and retry. Unknown Host:
    <a href="http://marketplace.eclipse.org/catalogs/api/p" rel="noreferrer">http://marketplace.eclipse.org/catalogs/api/p</a> marketplace.eclipse.org
    Cannot resolve host</p>
    
    <p>This is most often caused by a problem with your internet connection.
    Please check your internet connection and retry.
    marketplace.eclipse.org</p>
  </blockquote>
  
  <p>I tried below things as per solution suggested by some people.</p>
  
  <ol>
  <li>Go to Window-> Preferences -> General -> Network Connection. And
  change below settings Active Provider-> Manual-> and check---> HTTP,
  HTTPS and SOCS. After restarting eclipse still the problem persisted.</li>
  <li>I tried connecting to google.com from Eclipse Internet Explorer and able to see google homepage</li>
  <li>Added line in eclipse.ini file
  <strong>-vmargs
  -Djava.net.preferIPv4Stack=true</strong> But still same issue</li>
  </ol>
  
  <p>I am really frustated by this issue and couldn't find any help anywhere. If anyone has faced this issue and has an effective resolution, please assist.</p>
  
  <p>Below is the snap of Proxy details
  <a href="https://i.stack.imgur.com/Bdy0H.png" rel="noreferrer"><img src="https://i.stack.imgur.com/Bdy0H.png" alt="enter image description here"></a></p>