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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: sessionserver.mojang.com	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:184)	at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:172)	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)	at java.net.Socket.connect(Socket.java:589)	at sun.security.ssl.SSLSocketImpl.connect(SSLSocketImpl.java:649)	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)	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:1146)	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:997)	at sun.net.www.protocol.https.AbstractDelegateHttpsURLConnection.connect(AbstractDelegateHttpsURLConnection.java:177)	at sun.net.www.protocol.http.HttpURLConnection.getInputStream0(HttpURLConnection.java:1511)	at sun.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection.java:1439)	at sun.net.www.protocol.https.HttpsURLConnectionImpl.getInputStream(HttpsURLConnectionImpl.java:254)	at com.mojang.authlib.HttpAuthenticationService.performGetRequest(HttpAuthenticationService.java:126)	at com.mojang.authlib.yggdrasil.YggdrasilAuthenticationService.makeRequest(YggdrasilAuthenticationService.java:54)	at com.mojang.authlib.yggdrasil.YggdrasilMinecraftSessionService.fillGameProfile(YggdrasilMinecraftSessionService.java:175)	at com.mojang.authlib.yggdrasil.YggdrasilMinecraftSessionService$1.load(YggdrasilMinecraftSessionService.java:59)	at com.mojang.authlib.yggdrasil.YggdrasilMinecraftSessionService$1.load(YggdrasilMinecraftSessionService.java:56)	at com.google.common.cache.LocalCache$LoadingValueReference.loadFuture(LocalCache.java:3524)	at com.google.common.cache.LocalCache$Segment.loadSync(LocalCache.java:2317)	at com.google.common.cache.LocalCache$Segment.lockedGetOrLoad(LocalCache.java:2280)	at com.google.common.cache.LocalCache$Segment.get(LocalCache.java:2195)	at com.google.common.cache.LocalCache.get(LocalCache.java:3934)	at com.google.common.cache.LocalCache.getOrLoad(LocalCache.java:3938)	at com.google.common.cache.LocalCache$LocalLoadingCache.get(LocalCache.java:4821)	at com.google.common.cache.LocalCache$LocalLoadingCache.getUnchecked(LocalCache.java:4827)	at com.mojang.authlib.yggdrasil.YggdrasilMinecraftSessionService.fillProfileProperties(YggdrasilMinecraftSessionService.java:165)	at bcd.L(SourceFile:2764)	at bwk$3.run(SourceFile:106)	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)	at java.util.concurrent.FutureTask.run(FutureTask.java:266)	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)	at java.lang.Thread.run(Thread.java:745)