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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".

java.net.UnknownHostException: api.github.com	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:184)	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)	at java.net.Socket.connect(Socket.java:589)	at sun.security.ssl.SSLSocketImpl.connect(SSLSocketImpl.java:656)	at sun.security.ssl.BaseSSLSocketImpl.connect(BaseSSLSocketImpl.java:173)	at sun.net.NetworkClient.doConnect(NetworkClient.java:180)	at sun.net.www.http.HttpClient.openServer(HttpClient.java:432)	at sun.net.www.http.HttpClient.openServer(HttpClient.java:527)	at sun.net.www.protocol.https.HttpsClient.(HttpsClient.java:275)	at sun.net.www.protocol.https.HttpsClient.New(HttpsClient.java:371)	at sun.net.www.protocol.https.AbstractDelegateHttpsURLConnection.getNewHttpClient(AbstractDelegateHttpsURLConnection.java:191)	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1104)	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:998)	at sun.net.www.protocol.https.AbstractDelegateHttpsURLConnection.connect(AbstractDelegateHttpsURLConnection.java:177)	at sun.net.www.protocol.http.HttpURLConnection.getInputStream0(HttpURLConnection.java:1512)	at sun.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection.java:1440)	at java.net.HttpURLConnection.getResponseCode(HttpURLConnection.java:480)	at sun.net.www.protocol.https.HttpsURLConnectionImpl.getResponseCode(HttpsURLConnectionImpl.java:338)	at org.kohsuke.github.Requester.parse(Requester.java:447)	at org.kohsuke.github.Requester._to(Requester.java:224)	at org.kohsuke.github.Requester.to(Requester.java:191)	at org.kohsuke.github.GitHub.getRepository(GitHub.java:321)	at com.tw.go.plugin.provider.github.GitHubProvider.updateCommitStatus(GitHubProvider.java:54)	at com.tw.go.plugin.provider.github.GitHubProvider.updateStatus(GitHubProvider.java:48)	at com.tw.go.plugin.BuildStatusNotifierPlugin.handleStageNotification(BuildStatusNotifierPlugin.java:178)	at com.tw.go.plugin.BuildStatusNotifierPlugin.handle(BuildStatusNotifierPlugin.java:88)	at com.thoughtworks.go.plugin.infra.DefaultPluginManager$1.execute(DefaultPluginManager.java:172)	at com.thoughtworks.go.plugin.infra.DefaultPluginManager$1.execute(DefaultPluginManager.java:167)	at com.thoughtworks.go.plugin.infra.FelixGoPluginOSGiFramework.executeActionOnTheService(FelixGoPluginOSGiFramework.java:315)	at com.thoughtworks.go.plugin.infra.FelixGoPluginOSGiFramework.doOn(FelixGoPluginOSGiFramework.java:245)	at com.thoughtworks.go.plugin.infra.DefaultPluginManager.submitTo(DefaultPluginManager.java:167)	at com.thoughtworks.go.plugin.access.PluginRequestHelper.submitRequest(PluginRequestHelper.java:33)	at com.thoughtworks.go.plugin.access.notification.NotificationExtension.notify(NotificationExtension.java:74)	at com.thoughtworks.go.server.messaging.plugin.PluginNotificationService.notifyPlugin(PluginNotificationService.java:61)	at com.thoughtworks.go.server.messaging.plugin.PluginNotificationService.notifyPlugins(PluginNotificationService.java:53)	at com.thoughtworks.go.server.messaging.plugin.PluginNotificationListener.onMessage(PluginNotificationListener.java:30)	at com.thoughtworks.go.server.messaging.plugin.PluginNotificationListener.onMessage(PluginNotificationListener.java:21)	at com.thoughtworks.go.server.messaging.activemq.JMSMessageListenerAdapter.runImpl(JMSMessageListenerAdapter.java:65)	at com.thoughtworks.go.server.messaging.activemq.JMSMessageListenerAdapter.run(JMSMessageListenerAdapter.java:50)	at java.lang.Thread.run(Thread.java:745)