升级到Xamarin.iOS 9.8.0.323后外部IP地址的名称解析失败

我的Xamarin应用程序在与后端web服务通信时使用外部IP地址。使用Xamarin.iOS 9.6.2.4，呼叫成功。升级到Xamarin.iOS 9.8.0.323后，我现在遇到一个异常，消息是“Error:namesolutionfailure”

如果切换到使用内部IP地址或FQDN，则调用成功

这似乎是最新Xamarin更新中的一个bug，还是应该更改请求的方式

try
{
  //Exception message - Error:NameResolutionFailure
  string url = "http://[External-IP-Address]:8081/MyWebService/api/GetByID/1";

  //The following two URLs are successful
  //string url = "http://[Internal-IP-Address]:8081/MyWebService/api/GetByID/1";
  //string url = "http://[Fully-Qualified-Domain-Name]:8081/MyWebService/api/GetByID/1";

  HttpWebRequest request = (HttpWebRequest)HttpWebRequest.Create(new Uri(url));
  request.ContentType = "application/json";
  request.Method = "GET";
  request.Timeout = 10 * 60 * 1000;

  using (WebResponse response = await request.GetResponseAsync())
  {
    using (StreamReader reader = new StreamReader(response.GetResponseStream()))
    {
      string jsonData = reader.ReadToEnd();
    }
  }
}
catch (Exception e)
{
  Console.WriteLine(e.Message);
}

异常堆栈跟踪

at System.Net.HttpWebRequest.EndGetResponse (IAsyncResult asyncResult) [0x0005e] in /Users/builder/data/lanes/3339/39ebb778/source/maccore/_build/Library/Frameworks/Xamarin.iOS.framework/Versions/git/src/mono/mcs/class/System/System.Net/HttpWebRequest.cs:1005 
at System.Threading.Tasks.TaskFactory`1[TResult].FromAsyncCoreLogic (IAsyncResult iar, System.Func`2 endFunction, System.Action`1 endAction, System.Threading.Tasks.Task`1 promise, Boolean requiresSynchronization) [0x00014] in /Users/builder/data/lanes/3339/39ebb778/source/maccore/_build/Library/Frameworks/Xamarin.iOS.framework/Versions/git/src/mono/external/referencesource/mscorlib/system/threading/Tasks/FutureFactory.cs:550 
--- End of stack trace from previous location where exception was thrown ---
at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw () [0x0000c] in /Users/builder/data/lanes/3339/39ebb778/source/maccore/_build/Library/Frameworks/Xamarin.iOS.framework/Versions/git/src/mono/external/referencesource/mscorlib/system/runtime/exceptionservices/exceptionservicescommon.cs:143 
at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess (System.Threading.Tasks.Task task) [0x00047] in /Users/builder/data/lanes/3339/39ebb778/source/maccore/_build/Library/Frameworks/Xamarin.iOS.framework/Versions/git/src/mono/external/referencesource/mscorlib/system/runtime/compilerservices/TaskAwaiter.cs:187 
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification (System.Threading.Tasks.Task task) [0x0002e] in /Users/builder/data/lanes/3339/39ebb778/source/maccore/_build/Library/Frameworks/Xamarin.iOS.framework/Versions/git/src/mono/external/referencesource/mscorlib/system/runtime/compilerservices/TaskAwaiter.cs:156 
at System.Runtime.CompilerServices.TaskAwaiter.ValidateEnd (System.Threading.Tasks.Task task) [0x0000b] in /Users/builder/data/lanes/3339/39ebb778/source/maccore/_build/Library/Frameworks/Xamarin.iOS.framework/Versions/git/src/mono/external/referencesource/mscorlib/system/runtime/compilerservices/TaskAwaiter.cs:128 
at System.Runtime.CompilerServices.TaskAwaiter`1[TResult].GetResult () [0x00000] in /Users/builder/data/lanes/3339/39ebb778/source/maccore/_build/Library/Frameworks/Xamarin.iOS.framework/Versions/git/src/mono/external/referencesource/mscorlib/system/runtime/compilerservices/TaskAwaiter.cs:357 
at TestURL.ViewController+<ViewDidLoad>c__async0.MoveNext () [0x000b0] in /Users/Administrator/Projects/TestURL/TestURL/ViewController.cs:26 

位于/Users/builder/data/lanes/3339/39ebb778/source/maccore/_build/Library/Frameworks/Xamarin.iOS.framework/Versions/git/src/mono/mcs/class/System/System/System.Net/HttpWebRequest.cs:1005中的System.Net.HttpWebRequest.EndGetResponse（IAsyncResult asult asynchresult asresult）[0x0005e]
在System.Threading.Tasks.TaskFactory`1[TResult].FromAsyncCoreLogic（IAsyncResult iar，System.Func`2 endFunction，System.Action`1 endAction，System.Threading.Tasks.Task`1 Promission，Boolean requiresSynchronization）[0x00014]在/Users/builder/data/lanes/3339/39ebb778/source/maccore/_build/Library/Frameworks/Xamarin.iOS.framework/Versions/git/src/mono/external/referencesource/mscorlib/system/threading/Tasks/FutureFactory.cs:550中
---来自引发异常的上一个位置的堆栈结束跟踪---
在/Users/builder/data/lanes/3339/39ebb778/source/maccore/_build/Library/Frameworks/Xamarin.iOS.framework/Versions/git/src/mono/external/referencesource/mscorlib/System/Runtime/ExceptionServices/ExceptionServices common.cs:143中，在System.Runtime.ExceptionServices.ExceptionServices.ExceptionServices.twork中显示[0x0000c]
在/Users/builder/data/lanes/3339/39ebb778/source/maccore/_build/Library/Frameworks/Xamarin.iOS.framework/Versions/git/src/mono/external/referencesource/mscorlib/System/Runtime/CompilerServices/taskwaiter.ThrowForNonSuccess（System.Threading.Task.Task）[][0x00047]中
在/Users/builder/data/lanes/3339/39ebb778/source/maccore/_build/Library/Frameworks/Xamarin.iOS.framework/Versions/git/src/mono/external/referencesource/mscorlib/System/Runtime/CompilerServices/taskwaiter.HandleNonSuccessAndDebuggerNotification（System.Threading.Task任务）[0002e]0x0002e]中
在/Users/builder/data/lanes/3339/39ebb778/source/maccore/_build/Library/Frameworks/Xamarin.iOS.framework/Versions/git/src/mono/external/referencesource/mscorlib/System/Runtime/CompilerServices/TaskAwaiter.cs中的System.Runtime.CompilerServices.taskWaiter.ValidateEnd（System.Threading.Threading.Task.Task.Task.Task/referencesource/mscorlib
在/Users/builder/data/lanes/3339/39ebb778/source/maccore/_build/Library/Frameworks/Xamarin.iOS.framework/Versions/git/src/mono/external/referencesource/mscorlib/System/Runtime/CompilerServices/taskauiter.cs:357中，在System.Runtime.CompilerServices.Compilers
在/Users/Administrator/Projects/TestURL/TestURL/ViewController.cs:26中的TestURL.ViewController+c_uuasync0.MoveNext（）[0x000b0]

其他信息：

• 在iPhone 6s模拟器（iOS 9.3）上运行

---

经过一些研究，这是第7周期基线版本的一个已知问题。我们正在跟踪以下公共错误：

此时，最好的选择是停留在第6周期，或者（如果可能的话）使用完全限定的域名

---

谢谢

嘿！只是为了确认它确实是一个bug（看起来确实如此，但我想确认一下），您是否能够使用以下链接安装以前的稳定版本：and test？谢谢@clb是的，在降级到Xamarin.iOS 9.6.2.4之后，请求再次成功完成。好的！您是否愿意提供应用程序的副本，以便我将其作为私人bug提交给Xamarin工程师？只有在Xamarin内部工作的人才能访问它。是的，我可以提供演示错误的示例应用程序。我是否应该在填写错误报告（我不确定我将在哪里提供应用程序的副本）。通常我建议将其上载到Dropbox并将其链接到错误上。如果你粘贴到bug的链接（确保它被标记为private），我可以在Xamarin内升级并跟进。