【发布时间】：2018-12-04 19:56:13
【问题描述】：
我们发布了一个移动应用程序，但我们的一些用户无法连接到我们的应用程序。首先，我们猜测这是一个 dns 问题，因此我们将 DNS 从 Digital Ocean 更改为 Cloudflare，但它没有解决任何问题。 在 Android 设备上，我们使用 Retrofit 2.4 连接到我们的服务器。但是我们的一些用户无法连接到服务器，但他们可以在服务器上 ping，并且可以在浏览器中打开网站，但他们只能通过 vpn 连接。
我们从 firebase 获得了这个异常，我们使用 Retrofit 2.4.0 和 OKHTTP 3.10.0。他们的问题在 github 或网络上都没有。
Non-fatal Exception: java.net.UnknownHostException
Unable to resolve host "jomlex.com": No address associated with hostname
java.net.Inet6AddressImpl.lookupHostByName (Inet6AddressImpl.java:125)
java.net.InetAddress.getAllByName (InetAddress.java:752)
okhttp3.Dns$1.lookup (Dns.java:40)
okhttp3.internal.connection.RouteSelector.resetNextInetSocketAddress(RouteSelector.java:185)
okhttp3.internal.connection.RouteSelector.nextProxy (RouteSelector.java:149)
okhttp3.internal.connection.RouteSelector.next (RouteSelector.java:84)
okhttp3.internal.connection.StreamAllocation.findConnection (StreamAllocation.java:214)
okhttp3.internal.connection.StreamAllocation.findHealthyConnection (StreamAllocation.java:135)
okhttp3.internal.connection.StreamAllocation.newStream (StreamAllocation.java:114)
okhttp3.internal.connection.ConnectInterceptor.intercept (ConnectInterceptor.java:42)
okhttp3.internal.http.RealInterceptorChain.proceed (RealInterceptorChain.java:147)
okhttp3.internal.http.RealInterceptorChain.proceed (RealInterceptorChain.java:121)
okhttp3.internal.cache.CacheInterceptor.intercept (CacheInterceptor.java:93)
okhttp3.internal.http.RealInterceptorChain.proceed (RealInterceptorChain.java:147)
okhttp3.internal.http.RealInterceptorChain.proceed (RealInterceptorChain.java:121)
okhttp3.internal.http.BridgeInterceptor.intercept (BridgeInterceptor.java:93)
okhttp3.internal.http.RealInterceptorChain.proceed (RealInterceptorChain.java:147)
okhttp3.internal.http.RetryAndFollowUpInterceptor.intercept (RetryAndFollowUpInterceptor.java:126)
okhttp3.internal.http.RealInterceptorChain.proceed (RealInterceptorChain.java:147)
okhttp3.internal.http.RealInterceptorChain.proceed (RealInterceptorChain.java:121)
okhttp3.RealCall.getResponseWithInterceptorChain (RealCall.java:200)
okhttp3.RealCall$AsyncCall.execute (RealCall.java:147)
okhttp3.internal.NamedRunnable.run (NamedRunnable.java:32)
java.util.concurrent.ThreadPoolExecutor.runWorker (ThreadPoolExecutor.java:1133)
java.lang.Thread.run (Thread.java:762)
Caused by android.system.GaiException
android_getaddrinfo failed: EAI_NODATA (No address associated with hostname)
libcore.io.Posix.android_getaddrinfo (Posix.java)
libcore.io.ForwardingOs.android_getaddrinfo (ForwardingOs.java:55)
java.net.Inet6AddressImpl.lookupHostByName (Inet6AddressImpl.java:106)
java.net.Inet6AddressImpl.lookupAllHostAddr (Inet6AddressImpl.java:74)
java.net.InetAddress.getAllByName (InetAddress.java:752)
okhttp3.Dns$1.lookup (Dns.java:40)
okhttp3.internal.connection.RouteSelector.resetNextInetSocketAddress (RouteSelector.java:185)
okhttp3.internal.connection.RouteSelector.nextProxy (RouteSelector.java:149)
okhttp3.internal.connection.RouteSelector.next (RouteSelector.java:84)
okhttp3.internal.connection.StreamAllocation.findConnection (StreamAllocation.java:214)
okhttp3.internal.connection.StreamAllocation.findHealthyConnection (StreamAllocation.java:135)
okhttp3.internal.connection.StreamAllocation.newStream (StreamAllocation.java:114)
okhttp3.internal.connection.ConnectInterceptor.intercept (ConnectInterceptor.java:42)
okhttp3.internal.http.RealInterceptorChain.proceed (RealInterceptorChain.java:147)
okhttp3.internal.http.RealInterceptorChain.proceed (RealInterceptorChain.java:121)
okhttp3.internal.cache.CacheInterceptor.intercept (CacheInterceptor.java:93)
okhttp3.internal.http.RealInterceptorChain.proceed (RealInterceptorChain.java:147)
okhttp3.internal.http.RealInterceptorChain.proceed (RealInterceptorChain.java:121)
okhttp3.internal.http.BridgeInterceptor.intercept (BridgeInterceptor.java:93)
okhttp3.internal.http.RealInterceptorChain.proceed (RealInterceptorChain.java:147)
okhttp3.internal.http.RetryAndFollowUpInterceptor.intercept (RetryAndFollowUpInterceptor.java:126)
okhttp3.internal.http.RealInterceptorChain.proceed (RealInterceptorChain.java:147)
okhttp3.internal.http.RealInterceptorChain.proceed (RealInterceptorChain.java:121)
okhttp3.RealCall.getResponseWithInterceptorChain (RealCall.java:200)
okhttp3.RealCall$AsyncCall.execute (RealCall.java:147)
okhttp3.internal.NamedRunnable.run (NamedRunnable.java:32)
java.util.concurrent.ThreadPoolExecutor.runWorker (ThreadPoolExecutor.java:1133)
java.util.concurrent.ThreadPoolExecutor$Worker.run (ThreadPoolExecutor.java:607)
java.lang.Thread.run (Thread.java:762)
【问题讨论】：
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在我看来是 Internet 连接问题而不是编码问题
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这个问题的一般原因是大多数情况下的权限。您是否在清单文件中添加 Internet 权限？
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@JonasLochmann 我不这么认为，当他们尝试连接时，他们正在支持聊天，我确定他们有 Internet 连接。
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@RutvikBhatt 是的，我说我们的一些用户无法连接，但他们可以连接 vpn，他们抛出这个异常，我认为 OKHTTP 中的 dns 有问题。
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@HoseinIT 你是如何解决这个问题的？我们的一些用户可以连接 VPN，这很奇怪！