When connecting to:
http://updates.jenkins-ci.org/stable/update-center.json
I see:
hudson.util.IOException2: Failed to download from http://updates.jenkins-ci.org/download/plugins/metrics/3.0.10/metrics.hpi
at hudson.model.UpdateCenter$UpdateCenterConfiguration.download(UpdateCenter.java:796)
at hudson.model.UpdateCenter$DownloadJob._run(UpdateCenter.java:1143)
at hudson.model.UpdateCenter$InstallationJob._run(UpdateCenter.java:1303)
at hudson.model.UpdateCenter$DownloadJob.run(UpdateCenter.java:1121)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471)
at java.util.concurrent.FutureTask.run(FutureTask.java:262)
at hudson.remoting.AtmostOneThreadExecutor$Worker.run(AtmostOneThreadExecutor.java:110)
at java.lang.Thread.run(Thread.java:745)
Best regards
David