title: jenkins - cannot download and install plugin (multiple scm) - connection time out
body: <p>I am trying to add Multiple SCM plugin, and getting the following connection timeout error.  I am running the version 2.0.  No proxy setting.<br>
  Is there a way to get the plugin and install manually?  Thanks.</p>
  
  <pre><code>hudson.util.IOException2: Failed to download from http://updates.jenkins-ci.org/download/plugins/multiple-scms/0.6/multiple-scms.hpi (redirected to: http://mirrors.jenkins-ci.org/plugins/multiple-scms/0.6/multiple-scms.hpi)
      at hudson.model.UpdateCenter$UpdateCenterConfiguration.download(UpdateCenter.java:1153)
      at hudson.model.UpdateCenter$DownloadJob._run(UpdateCenter.java:1650)
      at hudson.model.UpdateCenter$InstallationJob._run(UpdateCenter.java:1848)
      at hudson.model.UpdateCenter$DownloadJob.run(UpdateCenter.java:1624)
      at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source)
      at java.util.concurrent.FutureTask.run(Unknown Source)
      at hudson.remoting.AtmostOneThreadExecutor$Worker.run(AtmostOneThreadExecutor.java:110)
      at java.lang.Thread.run(Unknown Source)
  Caused by: java.net.SocketTimeoutException: connect timed out
      at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
      at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source)
      at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source)
      at java.lang.reflect.Constructor.newInstance(Unknown Source)
      at sun.net.www.protocol.http.HttpURLConnection$10.run(Unknown Source)
      at sun.net.www.protocol.http.HttpURLConnection$10.run(Unknown Source)
      at java.security.AccessController.doPrivileged(Native Method)
      at sun.net.www.protocol.http.HttpURLConnection.getChainedException(Unknown Source)
      at sun.net.www.protocol.http.HttpURLConnection.getInputStream0(Unknown Source)
      at sun.net.www.protocol.http.HttpURLConnection.getInputStream(Unknown Source)
      at hudson.model.UpdateCenter$UpdateCenterConfiguration.download(UpdateCenter.java:1105)
      ... 7 more
  Caused by: java.net.SocketTimeoutException: connect timed out
      at java.net.DualStackPlainSocketImpl.waitForConnect(Native Method)
      at java.net.DualStackPlainSocketImpl.socketConnect(Unknown Source)
      at java.net.AbstractPlainSocketImpl.doConnect(Unknown Source)
      ... 7 more
  </code></pre>