Are you behind a http proxy? The uc metadata is downloaded via your browser, while the plugins are downloaded directly, so you can forget to configure the proxy settings on the advanced tab.
On Tuesday, 22 May 2012, Vaughn Spurlin wrote: > When I'm in Jenkins and try to install a plugin, I get the following "file > not found" error. It the Jenkins update center working correctly? > > java.io.FileNotFoundException: > http://updates.jenkins-ci.org/update-center.json?uctest at > sun.net.www.protocol.http.HttpURLConnection.getInputStream(Unknown Source) > at > hudson.model.UpdateCenter$UpdateCenterConfiguration.testConnection(UpdateCenter.java:735) > at > hudson.model.UpdateCenter$UpdateCenterConfiguration.checkUpdateCenter(UpdateCenter.java:584) > at hudson.model.UpdateCenter$ConnectionCheckJob.run(UpdateCenter.java:882) > at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source) at > java.util.concurrent.FutureTask$Sync.innerRun(Unknown Source) at > java.util.concurrent.FutureTask.run(Unknown Source) at > java.util.concurrent.ThreadPoolExecutor$Worker.runTask(Unknown Source) at > java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source) at > java.lang.Thread.run(Unknown Source) > > I've tried installing several plugins and get the same error. I've tried > "Clover Plugin", "Disk Usage Plugin", "Coverity Plugin".
