空白 ASP.NET Core 2.0 应用程序在 Azure 上失败，出现 502.5 错误，绑定失败，EACCESS 权限被拒绝

Question

我创建了一个新的 ASP.NET Core 2.0 Web 应用，并将其部署到 Azure 上的应用服务。但是，无论如何，尝试从 Azure 访问它时总是会导致 IIS 502.5 错误。它在本地运行良好。

重现步骤

1. 创建一个新的存储库
2. 在 Visual Studio 中克隆存储库
3. 在新存储库中的 VS 中创建新的 ASP.NET Core 2.0 Web 应用
4. 将更改推送到存储库
5. 在 Azure 中，创建一个新的应用服务
6. 将持续部署链接到存储库，选择 ASP.NET Core 作为应用类型
7. 构建完成后，尝试访问网站

请注意，它只是转到 HTTP 502.5 错误页面。

尝试在 Kudo 中从命令行运行该站点会导致以下结果...

有什么想法吗？这两天一直在努力解决这个问题！ ASP.NET Core 2.0 网站以前可以在我的 Azure 上运行，但后来就莫名其妙地停止为我工作了。

dotnet doesthiswork.dll
warn: Microsoft.AspNetCore.Server.Kestrel[0]

      Unable to bind to http://localhost:5000 on the IPv4 loopback interface: 'Error -4092 EACCES permission denied'.

warn: Microsoft.AspNetCore.Server.Kestrel[0]

      Unable to bind to http://localhost:5000 on the IPv6 loopback interface: 'Error -4092 EACCES permission denied'.

crit: Microsoft.AspNetCore.Server.Kestrel[0]

      Unable to start Kestrel.

System.IO.IOException: Failed to bind to address http://localhost:5000. ---> System.AggregateException: One or more errors occurred. (Error -4092 EACCES permission denied) (Error -4092 EACCES permission denied) ---> Microsoft.AspNetCore.Server.Kestrel.Transport.Libuv.Internal.Networking.UvException: Error -4092 EACCES permission denied

   at Microsoft.AspNetCore.Server.Kestrel.Transport.Libuv.Internal.Networking.LibuvFunctions.ThrowError(Int32 statusCode)

   at Microsoft.AspNetCore.Server.Kestrel.Transport.Libuv.Internal.Networking.LibuvFunctions.tcp_bind(UvTcpHandle handle, SockAddr& addr, Int32 flags)

   at Microsoft.AspNetCore.Server.Kestrel.Transport.Libuv.Internal.Networking.UvTcpHandle.Bind(IPEndPoint endPoint)

   at Microsoft.AspNetCore.Server.Kestrel.Transport.Libuv.Internal.Listener.ListenTcp(Boolean useFileHandle)

   at Microsoft.AspNetCore.Server.Kestrel.Transport.Libuv.Internal.Listener.CreateListenSocket()

   at Microsoft.AspNetCore.Server.Kestrel.Transport.Libuv.Internal.Listener.<>c.<StartAsync>b__8_0(Listener listener)

   at Microsoft.AspNetCore.Server.Kestrel.Transport.Libuv.Internal.LibuvThread.CallbackAdapter`1.<>c.<.cctor>b__3_1(Object callback, Object state)

   at Microsoft.AspNetCore.Server.Kestrel.Transport.Libuv.Internal.LibuvThread.DoPostWork()

--- End of stack trace from previous location where exception was thrown ---

   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()

   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)

   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)

   at System.Runtime.CompilerServices.ConfiguredTaskAwaitable.ConfiguredTaskAwaiter.GetResult()

   at Microsoft.AspNetCore.Server.Kestrel.Transport.Libuv.LibuvTransport.<BindAsync>d__20.MoveNext()

--- End of stack trace from previous location where exception was thrown ---

   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()

   at Microsoft.AspNetCore.Server.Kestrel.Transport.Libuv.LibuvTransport.<BindAsync>d__20.MoveNext()

--- End of stack trace from previous location where exception was thrown ---

   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()

   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)

   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)

   at Microsoft.AspNetCore.Server.Kestrel.Core.KestrelServer.<>c__DisplayClass23_0`1.<<StartAsync>g__OnBind|0>d.MoveNext()

--- End of stack trace from previous location where exception was thrown ---

   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()

   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)

   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)

   at System.Runtime.CompilerServices.ConfiguredTaskAwaitable.ConfiguredTaskAwaiter.GetResult()

   at Microsoft.AspNetCore.Server.Kestrel.Core.Internal.AddressBinder.<BindEndpointAsync>d__5.MoveNext()

--- End of stack trace from previous location where exception was thrown ---

   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()

   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)

   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)

   at System.Runtime.CompilerServices.ConfiguredTaskAwaitable.ConfiguredTaskAwaiter.GetResult()

   at Microsoft.AspNetCore.Server.Kestrel.Core.Internal.AddressBinder.<BindLocalhostAsync>d__6.MoveNext()

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

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

   at Microsoft.AspNetCore.Server.Kestrel.Core.Internal.AddressBinder.<BindLocalhostAsync>d__6.MoveNext()

--- End of stack trace from previous location where exception was thrown ---

   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()

   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)

   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)

   at System.Runtime.CompilerServices.ConfiguredTaskAwaitable.ConfiguredTaskAwaiter.GetResult()

   at Microsoft.AspNetCore.Server.Kestrel.Core.Internal.AddressBinder.DefaultAddressStrategy.<BindAsync>d__0.MoveNext()

--- End of stack trace from previous location where exception was thrown ---

   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()

   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)

   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)

   at System.Runtime.CompilerServices.ConfiguredTaskAwaitable.ConfiguredTaskAwaiter.GetResult()

   at Microsoft.AspNetCore.Server.Kestrel.Core.Internal.AddressBinder.<BindAsync>d__0.MoveNext()

--- End of stack trace from previous location where exception was thrown ---

   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()

   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)

   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)

   at Microsoft.AspNetCore.Server.Kestrel.Core.KestrelServer.<StartAsync>d__23`1.MoveNext()

应用错误分析页面显示以下内容

Your app failed to make an outbound TCP connection because the machine-wide TCP Connection limit was hit

Answer 1

想通了。我有另一个应用程序服务流氓并消耗所有 TCP 和套接字连接，因此任何其他应用程序服务都无法连接。

一旦我停止了那个流氓应用服务，事情又开始工作了。