com.mojang.authlib.exceptions.AuthenticationUnavailableException: Cannot contact authentication server

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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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    • com.mojang.authlib.exceptions.AuthenticationUnavailableException: Cannot contact authentication server at com.mojang.authlib.yggdrasil.YggdrasilAuthenticationService.makeRequest(YggdrasilAuthenticationService.java:71)[YggdrasilAuthenticationService.class:?] at com.mojang.authlib.yggdrasil.YggdrasilMinecraftSessionService.fillGameProfile(YggdrasilMinecraftSessionService.java:175)[YggdrasilMinecraftSessionService.class:?] at com.mojang.authlib.yggdrasil.YggdrasilMinecraftSessionService$1.load(YggdrasilMinecraftSessionService.java:59)[YggdrasilMinecraftSessionService$1.class:?] at com.mojang.authlib.yggdrasil.YggdrasilMinecraftSessionService$1.load(YggdrasilMinecraftSessionService.java:56)[YggdrasilMinecraftSessionService$1.class:?] at com.google.common.cache.LocalCache$LoadingValueReference.loadFuture(LocalCache.java:3524)[guava-17.0.jar:?] at com.google.common.cache.LocalCache$Segment.loadSync(LocalCache.java:2317)[guava-17.0.jar:?] at com.google.common.cache.LocalCache$Segment.lockedGetOrLoad(LocalCache.java:2280)[guava-17.0.jar:?] at com.google.common.cache.LocalCache$Segment.get(LocalCache.java:2195)[guava-17.0.jar:?] at com.google.common.cache.LocalCache.get(LocalCache.java:3934)[guava-17.0.jar:?] at com.google.common.cache.LocalCache.getOrLoad(LocalCache.java:3938)[guava-17.0.jar:?] at com.google.common.cache.LocalCache$LocalLoadingCache.get(LocalCache.java:4821)[guava-17.0.jar:?] at com.google.common.cache.LocalCache$LocalLoadingCache.getUnchecked(LocalCache.java:4827)[guava-17.0.jar:?] at com.mojang.authlib.yggdrasil.YggdrasilMinecraftSessionService.fillProfileProperties(YggdrasilMinecraftSessionService.java:165)[YggdrasilMinecraftSessionService.class:?] at bcd.L(SourceFile:2764)[bcd.class:?] at bwk$3.run(SourceFile:106)[bwk$3.class:?] at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)[?:1.8.0_25] at java.util.concurrent.FutureTask.run(FutureTask.java:266)[?:1.8.0_25] at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)[?:1.8.0_25] at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)[?:1.8.0_25] at java.lang.Thread.run(Thread.java:745)[?:1.8.0_25] Caused by: java.net.UnknownHostException: sessionserver.mojang.com at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:184)[?:1.8.0_25] at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:172)[?:1.8.0_25] at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)[?:1.8.0_25] at java.net.Socket.connect(Socket.java:589)[?:1.8.0_25] at sun.security.ssl.SSLSocketImpl.connect(SSLSocketImpl.java:649)[?:1.8.0_25] at sun.net.NetworkClient.doConnect(NetworkClient.java:175)[?:1.8.0_25] at sun.net.www.http.HttpClient.openServer(HttpClient.java:432)[?:1.8.0_25] at sun.net.www.http.HttpClient.openServer(HttpClient.java:527)[?:1.8.0_25] at sun.net.www.protocol.https.HttpsClient.<init>(HttpsClient.java:275)[?:1.8.0_25] at sun.net.www.protocol.https.HttpsClient.New(HttpsClient.java:371)[?:1.8.0_25] at sun.net.www.protocol.https.AbstractDelegateHttpsURLConnection.getNewHttpClient(AbstractDelegateHttpsURLConnection.java:191)[?:1.8.0_25] at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1146)[?:1.8.0_25] at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:997)[?:1.8.0_25] at sun.net.www.protocol.https.AbstractDelegateHttpsURLConnection.connect(AbstractDelegateHttpsURLConnection.java:177)[?:1.8.0_25] at sun.net.www.protocol.http.HttpURLConnection.getInputStream0(HttpURLConnection.java:1511)[?:1.8.0_25] at sun.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection.java:1439)[?:1.8.0_25] at sun.net.www.protocol.https.HttpsURLConnectionImpl.getInputStream(HttpsURLConnectionImpl.java:254)[?:1.8.0_25] at com.mojang.authlib.HttpAuthenticationService.performGetRequest(HttpAuthenticationService.java:126)[HttpAuthenticationService.class:?] at com.mojang.authlib.yggdrasil.YggdrasilAuthenticationService.makeRequest(YggdrasilAuthenticationService.java:54)[YggdrasilAuthenticationService.class:?] ... 19 more

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