hudson.util.IOException2: Failed to download from http://updates.jenkins-ci.org/download/war/2.0-alpha-1/jenkins.war (redirected to: http://mirrors.jenkins-ci.org/war/2.0-alpha-1/jenkins.war)
	at hudson.model.UpdateCenter$UpdateCenterConfiguration.download(UpdateCenter.java:821)
	at hudson.model.UpdateCenter$DownloadJob._run(UpdateCenter.java:1183)
	at hudson.model.UpdateCenter$DownloadJob.run(UpdateCenter.java:1161)
	at java.util.concurrent.Executors$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.io.FileNotFoundException: http://mirrors.jenkins-ci.org/war/2.0-alpha-1/jenkins.war
	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:773)
	... 6 more
Caused by: java.io.FileNotFoundException: http://mirrors.jenkins-ci.org/war/2.0-alpha-1/jenkins.war
	at sun.net.www.protocol.http.HttpURLConnection.getInputStream0(Unknown Source)
	at sun.net.www.protocol.http.HttpURLConnection.getInputStream(Unknown Source)
	at sun.net.www.protocol.http.HttpURLConnection.getHeaderField(Unknown Source)
	at java.net.URLConnection.getHeaderFieldLong(Unknown Source)
	at java.net.URLConnection.getContentLengthLong(Unknown Source)
	at java.net.URLConnection.getContentLength(Unknown Source)
	at hudson.model.UpdateCenter$UpdateCenterConfiguration.download(UpdateCenter.java:772)