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java.net.ConnectException: Connection refused: connect	at java.net.PlainSocketImpl.socketConnect(Native Method)	at java.net.PlainSocketImpl.doConnect(Unknown Source)	at java.net.PlainSocketImpl.connectToAddress(Unknown Source)	at java.net.PlainSocketImpl.connect(Unknown Source)	at java.net.SocksSocketImpl.connect(Unknown Source)	at java.net.Socket.connect(Unknown Source)	at java.net.Socket.connect(Unknown Source)	at sun.net.NetworkClient.doConnect(Unknown Source)	at sun.net.www.http.HttpClient.openServer(Unknown Source)	at sun.net.www.http.HttpClient.openServer(Unknown Source)	at sun.net.www.http.HttpClient.(Unknown Source)	at sun.net.www.http.HttpClient.New(Unknown Source)	at sun.net.www.http.HttpClient.New(Unknown Source)	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(Unknown Source)	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(Unknown Source)	at sun.net.www.protocol.http.HttpURLConnection.connect(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.getHeaderFieldInt(Unknown Source)	at java.net.URLConnection.getContentLength(Unknown Source)	at hudson.model.UpdateCenter$UpdateCenterConfiguration.download(UpdateCenter.java:623)	at hudson.model.UpdateCenter$DownloadJob._run(UpdateCenter.java:967)	at hudson.model.UpdateCenter$InstallationJob._run(UpdateCenter.java:1075)	at hudson.model.UpdateCenter$DownloadJob.run(UpdateCenter.java:949)	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)