在本地主机上发送http请求时出现套接字错误10013

Question

我在单个服务器上进行了此设置（通过 HTTP 进行通信的应用程序堆栈）：

IIS ARR proxy running on port 443 (open to world)

-->

localhost:6101 (service A: dotnet 6 windows service listening on port 6101 using Kestrel)

-->

IIS ARR proxy running on port 6200 (accepts only local traffic)

-->

localhost:6201 (service B: another dotnet 6 windows service listening on port 6201 using Kestrel)

偶尔（大约每天一次，但也可以是每小时一次或每隔几天一次）第一个 IIS 代理会随机响应 502.3 错误。当服务 A 向

localhost:6200/some_endpoint

发送 HTTP 请求时，就会发生这种情况。服务 A 无法与

localhost:6200

通信并报告以下异常：

2024-08-29 06:09:59,694 [116] ERROR 
System.Net.Http.HttpRequestException: An attempt was made to access a socket in a way forbidden by its access permissions. (127.0.0.1:6200)
 ---> System.Net.Sockets.SocketException (10013): An attempt was made to access a socket in a way forbidden by its access permissions.
   at System.Net.Sockets.Socket.AwaitableSocketAsyncEventArgs.ThrowException(SocketError error, CancellationToken cancellationToken)
   at System.Net.Sockets.Socket.AwaitableSocketAsyncEventArgs.System.Threading.Tasks.Sources.IValueTaskSource.GetResult(Int16 token)
   at System.Net.Sockets.Socket.<ConnectAsync>g__WaitForConnectWithCancellation|277_0(AwaitableSocketAsyncEventArgs saea, ValueTask connectTask, CancellationToken cancellationToken)
   at System.Net.Http.HttpConnectionPool.ConnectToTcpHostAsync(String host, Int32 port, HttpRequestMessage initialRequest, Boolean async, CancellationToken cancellationToken)
   --- End of inner exception stack trace ---
   at System.Net.Http.HttpConnectionPool.ConnectToTcpHostAsync(String host, Int32 port, HttpRequestMessage initialRequest, Boolean async, CancellationToken cancellationToken)
   at System.Net.Http.HttpConnectionPool.ConnectAsync(HttpRequestMessage request, Boolean async, CancellationToken cancellationToken)
   at System.Net.Http.HttpConnectionPool.CreateHttp11ConnectionAsync(HttpRequestMessage request, Boolean async, CancellationToken cancellationToken)
   at System.Net.Http.HttpConnectionPool.AddHttp11ConnectionAsync(HttpRequestMessage request)
   at System.Threading.Tasks.TaskCompletionSourceWithCancellation`1.WaitWithCancellationAsync(CancellationToken cancellationToken)
   at System.Net.Http.HttpConnectionPool.GetHttp11ConnectionAsync(HttpRequestMessage request, Boolean async, CancellationToken cancellationToken)
   at System.Net.Http.HttpConnectionPool.SendWithVersionDetectionAndRetryAsync(HttpRequestMessage request, Boolean async, Boolean doRequestAuth, CancellationToken cancellationToken)
   at System.Net.Http.DiagnosticsHandler.SendAsyncCore(HttpRequestMessage request, Boolean async, CancellationToken cancellationToken)
   at System.Net.Http.RedirectHandler.SendAsync(HttpRequestMessage request, Boolean async, CancellationToken cancellationToken)
   at Microsoft.Extensions.Http.Logging.LoggingHttpMessageHandler.SendAsync(HttpRequestMessage request, CancellationToken cancellationToken)
   at Microsoft.Extensions.Http.PolicyHttpMessageHandler.SendCoreAsync(HttpRequestMessage request, Context context, CancellationToken cancellationToken)
   at Polly.Timeout.AsyncTimeoutEngine.ImplementationAsync[TResult](Func`3 action, Context context, CancellationToken cancellationToken, Func`2 timeoutProvider, TimeoutStrategy timeoutStrategy, Func`5 onTimeoutAsync, Boolean continueOnCapturedContext)
   at Polly.Timeout.AsyncTimeoutEngine.ImplementationAsync[TResult](Func`3 action, Context context, CancellationToken cancellationToken, Func`2 timeoutProvider, TimeoutStrategy timeoutStrategy, Func`5 onTimeoutAsync, Boolean continueOnCapturedContext)
   at Polly.AsyncPolicy`1.ExecuteAsync(Func`3 action, Context context, CancellationToken cancellationToken, Boolean continueOnCapturedContext)
   at Microsoft.Extensions.Http.PolicyHttpMessageHandler.SendAsync(HttpRequestMessage request, CancellationToken cancellationToken)
   at Microsoft.Extensions.Http.Logging.LoggingScopeHttpMessageHandler.SendAsync(HttpRequestMessage request, CancellationToken cancellationToken)
   at System.Net.Http.HttpClient.<SendAsync>g__Core|83_0(HttpRequestMessage request, HttpCompletionOption completionOption, CancellationTokenSource cts, Boolean disposeCts, CancellationTokenSource pendingRequestsCts, CancellationToken originalCancellationToken)
   ...

3-10 分钟后一切恢复正常。我可以确认在 6201 上监听的应用程序仍然运行良好并且没有报告任何错误。在创建 TcpListener 或在保留端口上启动 Kestrel 服务器时，有很多有关此错误的信息，但当向现有侦听器发送 HTTP 请求时间歇性发生此错误时，我找不到有关此错误的任何有用信息。

问题：此类错误的根本原因可能是什么以及如何修复它？

Answer 1

根据 @jason.kaisersmith 评论，我设法查明了问题 - 我的防病毒软件随机阻止了本地主机上的一些请求（将它们检测为威胁）。解决方案：添加排除规则或禁用防病毒网络监控。