Eclipse Mars - eclipse.org.equinox.p2.core.provisionexception
<p>I installed eclipse mars in my <strong><em>windows 8.1 Pro</em></strong> pc and its update site as below</p>

<blockquote>
  <p>Mars</p>
  
  <p><a href="http://download.eclipse.org/releases/mars" rel="noreferrer">http://download.eclipse.org/releases/mars</a></p>
  
  <p>The Eclipse Project Updates</p>
  
  <p><a href="http://download.eclipse.org/eclipse/updates/4.5" rel="noreferrer">http://download.eclipse.org/eclipse/updates/4.5</a></p>
</blockquote>

<p>but when i try to reload,  it raises following <a href="https://i.stack.imgur.com/Q4LDr.png" rel="noreferrer"><img src="https://i.stack.imgur.com/Q4LDr.png" alt="error"></a></p>

<pre><code>No repository found at http://download.eclipse.org/releases/mars.
eclipse.org.equinox.p2.core.ProvisionException
</code></pre>

<p>i tried following solutions but none works for me.</p>

<ol>
<li><p>added <code>-Djava.net.preferIPv4Stack=true</code> in eclipse.ini</p></li>
<li><p>changed my <a href="https://i.stack.imgur.com/fT2H7.png" rel="noreferrer"><img src="https://i.stack.imgur.com/fT2H7.png" alt="network settings"></a> to <em>manual</em></p></li>
<li><p>Unchecked <em>"contact all software sites during install to find required software"</em> option under install new software</p></li>
</ol>

<p><strong>Note :</strong> Firewall is disabled</p>