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java.net.UnknownHostException: www.google.com at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:177) at java.net.Socket.connect(Socket.java:519) at java.net.Socket.connect(Socket.java:469) at sun.net.NetworkClient.doConnect(NetworkClient.java:157) 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.<init>(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:788) at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:767) at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:654) at sun.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection.java:977) at hudson.model.UpdateCenter$ConnectionCheckJob.testConnection(UpdateCenter.java:376) at hudson.model.UpdateCenter$ConnectionCheckJob.run(UpdateCenter.java:358) 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$Worker.runTask(ThreadPoolExecutor.java:885) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:907) at java.lang.Thread.run(Thread.java:619)