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  1. ,
    Expert tip

    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: s3.amazonaws.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.launcher.Http.performGet(Http.java:54)	at net.minecraft.launcher.updater.RemoteVersionList.getContent(RemoteVersionList.java:27)	at net.minecraft.launcher.updater.VersionList.refreshVersions(VersionList.java:85)	at net.minecraft.launcher.updater.MinecraftVersionManager.refreshVersions(MinecraftVersionManager.java:60)	at net.minecraft.launcher.Launcher$2.run(Launcher.java:133)	at java.util.concurrent.Executors$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)