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java.net.ConnectException: Connection timed out	at java.net.PlainSocketImpl.socketConnect(Native Method)	at java.net.PlainSocketImpl.doConnect(PlainSocketImpl.java:351)	at java.net.PlainSocketImpl.connectToAddress(PlainSocketImpl.java:213)	at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:200)	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:366)	at java.net.Socket.connect(Socket.java:529)	at java.net.Socket.connect(Socket.java:478)	at sun.net.NetworkClient.doConnect(NetworkClient.java:163)	at sun.net.www.http.HttpClient.openServer(HttpClient.java:394)	at sun.net.www.http.HttpClient.openServer(HttpClient.java:529)	at sun.net.www.http.HttpClient.(HttpClient.java:233)	at sun.net.www.http.HttpClient.New(HttpClient.java:306)	at sun.net.www.http.HttpClient.New(HttpClient.java:323)	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:970)	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:911)	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:836)	at sun.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection.java:1172)	at sun.net.www.protocol.http.HttpURLConnection.getHeaderField(HttpURLConnection.java:2304)	at java.net.URLConnection.getHeaderFieldInt(URLConnection.java:579)	at java.net.URLConnection.getContentLength(URLConnection.java:474)	at hudson.model.UpdateCenter$UpdateCenterConfiguration.download(UpdateCenter.java:565)	at hudson.model.UpdateCenter$DownloadJob._run(UpdateCenter.java:849)	at hudson.model.UpdateCenter$InstallationJob._run(UpdateCenter.java:957)	at hudson.model.UpdateCenter$DownloadJob.run(UpdateCenter.java:832)	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:441)	at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303)	at java.util.concurrent.FutureTask.run(FutureTask.java:138)	at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)	at java.lang.Thread.run(Thread.java:662)