com.sun.jersey.api.client.ClientHandlerException: java.net.UnknownHostException: api.github.com

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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: api.github.com	at java.net.AbstractPlainSocketImpl.connect(Unknown Source)	at java.net.PlainSocketImpl.connect(Unknown Source)	at java.net.SocksSocketImpl.connect(Unknown Source)	at java.net.Socket.connect(Unknown Source)	at sun.security.ssl.SSLSocketImpl.connect(Unknown Source)	at sun.security.ssl.BaseSSLSocketImpl.connect(Unknown Source)	at sun.net.NetworkClient.doConnect(Unknown Source)	at sun.net.www.http.HttpClient.openServer(Unknown Source)	at sun.net.www.http.HttpClient.openServer(Unknown Source)	at sun.net.www.protocol.https.HttpsClient.(Unknown Source)	at sun.net.www.protocol.https.HttpsClient.New(Unknown Source)	at sun.net.www.protocol.https.AbstractDelegateHttpsURLConnection.getNewHttpClient(Unknown Source)	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(Unknown Source)	at sun.net.www.protocol.https.AbstractDelegateHttpsURLConnection.connect(Unknown Source)	at sun.net.www.protocol.http.HttpURLConnection.getInputStream(Unknown Source)	at java.net.HttpURLConnection.getResponseCode(Unknown Source)	at sun.net.www.protocol.https.HttpsURLConnectionImpl.getResponseCode(Unknown Source)	at com.sun.jersey.client.urlconnection.URLConnectionClientHandler._invoke(URLConnectionClientHandler.java:218)	at com.sun.jersey.client.urlconnection.URLConnectionClientHandler.handle(URLConnectionClientHandler.java:129)	at com.sun.jersey.api.client.Client.handle(Client.java:616)	at com.sun.jersey.api.client.WebResource.handle(WebResource.java:559)	at com.sun.jersey.api.client.WebResource.get(WebResource.java:182)	at testetl.test_0_1.Test.tREST_1Process(Test.java:572)	at testetl.test_0_1.Test.runJobInTOS(Test.java:929)	at testetl.test_0_1.Test.main(Test.java:786)