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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: null	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:178)	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)	at java.net.Socket.connect(Socket.java:579)	at sun.security.ssl.SSLSocketImpl.connect(SSLSocketImpl.java:618)	at sun.security.ssl.SSLSocketImpl.(SSLSocketImpl.java:407)	at sun.security.ssl.SSLSocketFactoryImpl.createSocket(SSLSocketFactoryImpl.java:88)	at hudson.util.NoClientBindSSLProtocolSocketFactory.createSocket(NoClientBindSSLProtocolSocketFactory.java:135)	at hudson.util.NoClientBindSSLProtocolSocketFactory.createSocket(NoClientBindSSLProtocolSocketFactory.java:117)	at org.apache.commons.httpclient.HttpConnection.open(HttpConnection.java:707)	at org.apache.commons.httpclient.HttpMethodDirector.executeWithRetry(HttpMethodDirector.java:387)	at org.apache.commons.httpclient.HttpMethodDirector.executeMethod(HttpMethodDirector.java:171)	at org.apache.commons.httpclient.HttpClient.executeMethod(HttpClient.java:397)	at org.apache.commons.httpclient.HttpClient.executeMethod(HttpClient.java:323)	at jenkins.plugins.hipchat.StandardHipChatService.publish(StandardHipChatService.java:48)	at jenkins.plugins.hipchat.ActiveNotifier.notifyStart(ActiveNotifier.java:53)	at jenkins.plugins.hipchat.ActiveNotifier.started(ActiveNotifier.java:46)	at jenkins.plugins.hipchat.HipChatNotifier$HipChatJobProperty.prebuild(HipChatNotifier.java:203)	at hudson.model.AbstractBuild$AbstractBuildExecution.preBuild(AbstractBuild.java:806)	at hudson.model.AbstractBuild$AbstractBuildExecution.preBuild(AbstractBuild.java:801)	at hudson.model.AbstractBuild$AbstractBuildExecution.preBuild(AbstractBuild.java:797)	at hudson.model.AbstractBuild$AbstractBuildExecution.run(AbstractBuild.java:532)	at hudson.model.Run.execute(Run.java:1740)	at hudson.model.FreeStyleBuild.run(FreeStyleBuild.java:43)	at hudson.model.ResourceController.execute(ResourceController.java:88)	at hudson.model.Executor.run(Executor.java:233)