No repository found at http://download.eclipse.org/technology/m2e/releases
<p>I'm trying to install the m2Eclipse plugin, but when I try to add the site under available software sites I am getting this error: </p>

<blockquote>
  <p>"No repository found at
  <a href="http://download.eclipse.org/technology/m2e/releases" rel="noreferrer">http://download.eclipse.org/technology/m2e/releases</a>"</p>
</blockquote>

<p>With this stack trace:</p>

<pre><code>org.eclipse.equinox.p2.core.ProvisionException: No repository found at http://download.eclipse.org/technology/m2e/releases.
at org.eclipse.equinox.internal.p2.repository.helpers.AbstractRepositoryManager.fail(AbstractRepositoryManager.java:395)
at org.eclipse.equinox.internal.p2.repository.helpers.AbstractRepositoryManager.loadRepository(AbstractRepositoryManager.java:653)
at org.eclipse.equinox.internal.p2.metadata.repository.MetadataRepositoryManager.loadRepository(MetadataRepositoryManager.java:96)
at org.eclipse.equinox.internal.p2.metadata.repository.MetadataRepositoryManager.loadRepository(MetadataRepositoryManager.java:92)
at org.eclipse.equinox.p2.ui.LoadMetadataRepositoryJob.doLoad(LoadMetadataRepositoryJob.java:117)
at org.eclipse.equinox.p2.ui.LoadMetadataRepositoryJob.runModal(LoadMetadataRepositoryJob.java:102)
at org.eclipse.equinox.internal.p2.ui.sdk.PreloadingRepositoryHandler$2.runModal(PreloadingRepositoryHandler.java:83)
at org.eclipse.equinox.p2.operations.ProvisioningJob.run(ProvisioningJob.java:177)
at org.eclipse.core.internal.jobs.Worker.run(Worker.java:55)
</code></pre>

<p>This also occurs for any other repositories I try to add.</p>

<p>Based on <a href="https://stackoverflow.com/questions/7625943/unable-to-read-repository-at-http-download-eclipse-org-releases-indigo">this stack overflow question</a> some fixes are:</p>

<ol>
<li>Fix proxy settings and verify you are able to connect to the
internet with eclipses browser  </li>
<li>Remove and add site again (or
Reload) </li>
<li>Start eclipse with these properties: -vmargs
-Djava.net.preferIPv4Stack=true</li>
<li>Deleting the cache directory "\eclipse\p2\org.eclipse.equinox.p2.repository\cache"</li>
</ol>

<p>I was able to do (1) Fix proxy settings and connect to the repository in the browser.  It is even able to connect to the repository through the browser:</p>

<p><a href="https://i.stack.imgur.com/136h2.png" rel="noreferrer"><img src="https://i.stack.imgur.com/136h2.png" alt="successful internal browser"></a></p>

<p>But none of these solutions allowed me to install software when going through the Help -> Install new Software -> process.  Does anyone have any more information or troubleshooting advice for this issue?</p>