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    Check if you don't have a VPN or something like this messing with your connection. Also, check Jenkins DNS configurations (try to start it with "--dns 8.8.8.8".

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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.(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)