Azure.RequestFailedException：不知道这样的主机答案

【问题标题】：Azure.RequestFailedException: No such host is knownAzure.RequestFailedException：不知道这样的主机
【发布时间】：2020-06-20 16:05:03
【问题描述】：

我有一个应用程序（aspnet 核心应用程序 3.1），我在启动期间使用以下代码从 azure blob 存储加载数据：

BlobClient client = new BlobClient(loaderOptions.ConnectionString, loaderOptions.BlobContainerName, loaderOptions.BlobName);

var response = client.Download();

using (var memoryStream = new MemoryStream())
{
     response.Value.Content.CopyTo(memoryStream);
     return memoryStream.ToArray();
}

在本地，在我的电脑上一切正常。但是，当我将此应用程序发布到 azure 应用程序服务（Windows）时，我收到以下错误：

Unhandled exception. System.AggregateException: Retry failed after 6 tries. (No such host is known.) (No such host is known.) (No such host is known.) (No such host is known.) (No such host is known.) (No such host is known.)

 ---> Azure.RequestFailedException: No such host is known.

 ---> System.Net.Http.HttpRequestException: No such host is known.

 ---> System.Net.Sockets.SocketException (11001): No such host is known.

   at System.Net.Http.ConnectHelper.ConnectAsync(String host, Int32 port, CancellationToken cancellationToken)

   --- End of inner exception stack trace ---

   at System.Net.Http.ConnectHelper.ConnectAsync(String host, Int32 port, CancellationToken cancellationToken)

   at System.Net.Http.HttpConnectionPool.ConnectAsync(HttpRequestMessage request, Boolean allowHttp2, CancellationToken cancellationToken)

   at System.Net.Http.HttpConnectionPool.CreateHttp11ConnectionAsync(HttpRequestMessage request, CancellationToken cancellationToken)

   at System.Net.Http.HttpConnectionPool.GetHttpConnectionAsync(HttpRequestMessage request, CancellationToken cancellationToken)

   at System.Net.Http.HttpConnectionPool.SendWithRetryAsync(HttpRequestMessage request, Boolean doRequestAuth, CancellationToken cancellationToken)

   at System.Net.Http.RedirectHandler.SendAsync(HttpRequestMessage request, CancellationToken cancellationToken)

   at System.Net.Http.HttpClient.FinishSendAsyncUnbuffered(Task`1 sendTask, HttpRequestMessage request, CancellationTokenSource cts, Boolean disposeCts)

   at Azure.Core.Pipeline.HttpClientTransport.ProcessAsync(HttpMessage message)

   --- End of inner exception stack trace ---

一周前一切正常。现在我创建了新的服务计划和存储帐户（删除了旧的）并遇到了这个问题。

有什么解决办法？

【问题讨论】：

您是否在本地和 Azure 环境中连接到同一个存储帐户？
是的，我知道，这很奇怪..
我想知道您的存储帐户是否位于阻止应用服务访问的防火墙后面。你能检查一下吗？
我已在防火墙设置中检查了所有网络
你解决了吗？我遇到了同样的问题，有趣的是它只发生在我的本地机器上。

标签： azure azure-blob-storage

【解决方案1】：

我遇到了同样的问题。进一步分析表明，本地 DNS 问题。如果有疑问，请跟踪提供的地址并在需要时在 c:\windows

中添加临时主机记录

【讨论】：