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

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Root Cause Analysis

  1. java.net.UnknownHostException

    authserver.mojang.com

    at java.net.AbstractPlainSocketImpl.connect()
  2. Java RT
    Socket.connect
    1. java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:184)[?:1.8.0_25]
    2. java.net.PlainSocketImpl.connect(PlainSocketImpl.java:172)[?:1.8.0_25]
    3. java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)[?:1.8.0_25]
    4. java.net.Socket.connect(Socket.java:589)[?:1.8.0_25]
    4 frames
  3. Java JSSE
    SSLSocketImpl.connect
    1. sun.security.ssl.SSLSocketImpl.connect(SSLSocketImpl.java:649)[?:1.8.0_25]
    1 frame
  4. Java RT
    HttpsURLConnectionImpl.getOutputStream
    1. sun.net.NetworkClient.doConnect(NetworkClient.java:175)[?:1.8.0_25]
    2. sun.net.www.http.HttpClient.openServer(HttpClient.java:432)[?:1.8.0_25]
    3. sun.net.www.http.HttpClient.openServer(HttpClient.java:527)[?:1.8.0_25]
    4. sun.net.www.protocol.https.HttpsClient.<init>(HttpsClient.java:275)[?:1.8.0_25]
    5. sun.net.www.protocol.https.HttpsClient.New(HttpsClient.java:371)[?:1.8.0_25]
    6. sun.net.www.protocol.https.AbstractDelegateHttpsURLConnection.getNewHttpClient(AbstractDelegateHttpsURLConnection.java:191)[?:1.8.0_25]
    7. sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1146)[?:1.8.0_25]
    8. sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:997)[?:1.8.0_25]
    9. sun.net.www.protocol.https.AbstractDelegateHttpsURLConnection.connect(AbstractDelegateHttpsURLConnection.java:177)[?:1.8.0_25]
    10. sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1281)[?:1.8.0_25]
    11. sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1256)[?:1.8.0_25]
    12. sun.net.www.protocol.https.HttpsURLConnectionImpl.getOutputStream(HttpsURLConnectionImpl.java:250)[?:1.8.0_25]
    12 frames
  5. com.mojang.authlib
    YggdrasilUserAuthentication.logIn
    1. com.mojang.authlib.HttpAuthenticationService.performPostRequest(HttpAuthenticationService.java:73)[launcher.jar:1.6.39]
    2. com.mojang.authlib.yggdrasil.YggdrasilAuthenticationService.makeRequest(YggdrasilAuthenticationService.java:54)[launcher.jar:1.6.39]
    3. com.mojang.authlib.yggdrasil.YggdrasilUserAuthentication.logInWithToken(YggdrasilUserAuthentication.java:132)[launcher.jar:1.6.39]
    4. com.mojang.authlib.yggdrasil.YggdrasilUserAuthentication.logIn(YggdrasilUserAuthentication.java:55)[launcher.jar:1.6.39]
    4 frames
  6. net.minecraft.launcher
    Launcher$2.run
    1. net.minecraft.launcher.Launcher.ensureLoggedIn(Launcher.java:215)[launcher.jar:1.6.39]
    2. net.minecraft.launcher.Launcher$2.run(Launcher.java:169)[launcher.jar:1.6.39]
    2 frames
  7. Java RT
    Thread.run
    1. java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)[?:1.8.0_25]
    2. java.util.concurrent.FutureTask.run(FutureTask.java:266)[?:1.8.0_25]
    3. java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)[?:1.8.0_25]
    4. java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)[?:1.8.0_25]
    5. java.lang.Thread.run(Thread.java:745)[?:1.8.0_25]
    5 frames