Asp.Net Core: HttpRequestException при вызове внешнего API

У меня проблема с выполнением HTTP-вызовов внешнего API с использованием HTTPS (TLS 1.2) из ​​моего веб-приложения .NET Core 1.1. Приложение работает нормально локально, но при развертывании в службах приложений Azure я получаю следующее исключение:

exceptionMessage:An error occurred while sending the request.
exceptionType:System.Net.Http.HttpRequestException

Внутреннее исключение:

innerExceptionMessage:A security error occurred
innerExceptionType:System.Net.Http.WinHttpException

Странно то, что я получаю это исключение не на все запросы к внешнему API, оно случается только несколько раз.

Я заметил, что подобные вопросы обсуждались в других сообщениях SO, но большинство из них касались самозаверяющих сертификатов. В моем случае удаленный сервер использует сертификат, подписанный GeoTrust.

Все звонки совершаются с System.Net.Http.HttpClient

Связанный:

• Asp.Net Core: вызов другого REST-Api вызывает WebException
• .net core API Post исключение дает NativeErrorCode 12175
• Запрос HTTPS не выполняется с использованием HttpClient
• Ошибка безопасности, сообщение с клиентом Сертификат (самоподписанный корень) в Azure (ядро Asp.net)

Полная трассировка стека:

{ exceptionType: "System.Net.Http.HttpRequestException", innerException: { innerStacktrace: " at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task) at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) at System.Runtime.CompilerServices.ConfiguredTaskAwaitable`1.ConfiguredTaskAwaiter.GetResult() at System.Net.Http.WinHttpHandler.<StartRequest>d__105.MoveNext()", innerExceptionMessage: "A security error occurred", innerExceptionType: "System.Net.Http.WinHttpException" }, stacktrace: " at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task) at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) at System.Runtime.CompilerServices.ConfiguredTaskAwaitable`1.ConfiguredTaskAwaiter.GetResult() at System.Net.Http.HttpClient.<FinishSendAsync>d__58.MoveNext() --- End of stack trace from previous location where exception was thrown --- at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task) at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) at Integration.Services.ApiService.<PostResourceToApiAsync>d__5`1.MoveNext() in C:\projects\integration\src\Integration\Services\ApiService.cs:line 112 --- End of stack trace from previous location where exception was thrown --- at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task) at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) at Integration.Services.AccountService.<NotifyOwnerAsync>d__12.MoveNext() in C:\projects\integration\src\Integration\Services\AccountService.cs:line 115 --- End of stack trace from previous location where exception was thrown --- at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task) at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) at Integration.Services.AccountService.<CreateAccountAsync>d__9.MoveNext() in C:\projects\integration\src\Integration\Services\AccountService.cs:line 66 --- End of stack trace from previous location where exception was thrown --- at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task) at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) at Integration.Services.PartnerService.<CreateAccountAsync>d__11.MoveNext() in C:\projects\integration\src\Integration\Services\PartnerService.cs:line 100 --- End of stack trace from previous location where exception was thrown --- at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task) at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) at Integration.Controllers.AccountsController.<Create>d__7.MoveNext() in C:\projects\integration\src\Integration\Controllers\AccountsController.cs:line 92 --- End of stack trace from previous location where exception was thrown --- at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task) at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) at Microsoft.AspNetCore.Mvc.Internal.ControllerActionInvoker.<InvokeActionMethodAsync>d__27.MoveNext() --- End of stack trace from previous location where exception was thrown --- at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task) at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) at Microsoft.AspNetCore.Mvc.Internal.ControllerActionInvoker.<InvokeNextActionFilterAsync>d__25.MoveNext() --- End of stack trace from previous location where exception was thrown --- at Microsoft.AspNetCore.Mvc.Internal.ControllerActionInvoker.Rethrow(ActionExecutedContext context) at Microsoft.AspNetCore.Mvc.Internal.ControllerActionInvoker.Next(State& next, Scope& scope, Object& state, Boolean& isCompleted) at Microsoft.AspNetCore.Mvc.Internal.ControllerActionInvoker.<InvokeNextExceptionFilterAsync>d__24.MoveNext()", exceptionMessage: "An error occurred while sending the request." }