Google API calls hangs on production web server - iis

Question

Calendar API->service accounts
The calls works normally on local development machine (Visual studio) but hangs on production Web Server.
The call:
var private_key = #"mykey";
var client_email = #"myservicemail";
var credential =
new ServiceAccountCredential(
new ServiceAccountCredential.Initializer(client_email)
{
Scopes = new string[] { CalendarService.Scope.Calendar },
User= account,
}.FromPrivateKey(private_key));
var service = new CalendarService(new BaseClientService.Initializer()
{
HttpClientInitializer = credential,
ApplicationName = ApplicationName,
});
var calendars = service.CalendarList.List().Execute().Items;
Error:
Errore durante il caricamento dei calendari: An error occurred while sending the request.
in Google.Apis.Http.ConfigurableMessageHandler.d__69.MoveNext() --- Fine traccia dello stack da posizione precedente dove è stata generata l'eccezione --- in System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task) in System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) in Google.Apis.Auth.OAuth2.Requests.TokenRequestExtenstions.d__1.MoveNext() --- Fine traccia dello stack da posizione precedente dove è stata generata l'eccezione --- in System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task) in System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) in Google.Apis.Auth.OAuth2.ServiceAccountCredential.d__26.MoveNext() --- Fine traccia dello stack da posizione precedente dove è stata generata l'eccezione --- in System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task) in System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) in Google.Apis.Auth.OAuth2.TokenRefreshManager.d__12.MoveNext() --- Fine traccia dello stack da posizione precedente dove è stata generata l'eccezione --- in Google.Apis.Auth.OAuth2.TokenRefreshManager.ResultWithUnwrappedExceptions[T](Task1 task) in System.Threading.Tasks.ContinuationResultTaskFromResultTask2.InnerInvoke() in System.Threading.Tasks.Task.Execute() --- Fine traccia dello stack da posizione precedente dove è stata generata l'eccezione --- in System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task) in System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) in Google.Apis.Auth.OAuth2.TokenRefreshManager.d__10.MoveNext() --- Fine traccia dello stack da posizione precedente dove è stata generata l'eccezione --- in System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task) in System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) in System.Runtime.CompilerServices.ConfiguredTaskAwaitable1.ConfiguredTaskAwaiter.GetResult() in Google.Apis.Auth.OAuth2.ServiceAccountCredential.d__27.MoveNext() --- Fine traccia dello stack da posizione precedente dove è stata generata l'eccezione --- in System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task) in System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) in Google.Apis.Auth.OAuth2.ServiceCredential.d__32.MoveNext() --- Fine traccia dello stack da posizione precedente dove è stata generata l'eccezione --- in System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task) in System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) in Google.Apis.Auth.OAuth2.ServiceCredential.d__29.MoveNext() --- Fine traccia dello stack da posizione precedente dove è stata generata l'eccezione --- in System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task) in System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) in Google.Apis.Http.ConfigurableMessageHandler.d__71.MoveNext() --- Fine traccia dello stack da posizione precedente dove è stata generata l'eccezione --- in System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task) in System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) in Google.Apis.Http.ConfigurableMessageHandler.d__69.MoveNext() --- Fine traccia dello stack da posizione precedente dove è stata generata l'eccezione --- in System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task) in System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) in Google.Apis.Requests.ClientServiceRequest1.d__30.MoveNext() --- Fine traccia dello stack da posizione precedente dove è stata generata l'eccezione --- in System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw() in Google.Apis.Requests.ClientServiceRequest`1.Execute() in TalentformCRMM.Gestione.Report.btImportaCalendariDaGsuite_Click(Object sender, EventArgs e) in C:\inetpub\wwwroot\TalentformCRMM\TalentformCRMM\Gestione\Reports.aspx.cs:riga 2376
web.config
<?xml version="1.0" encoding="utf-8"?>
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If you are deploying to a cloud environment that has multiple web server instances,
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before trusting HTTPS certificates. But this setting tends to not
be allowed in shared hosting environments. -->
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<add name="X-Frame-Options" value="SAMEORIGIN" />
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</system.webServer>
</configuration>

Answer 1

Solved. Google Api works with IIS > 7 and stucks with IIS 7.
Simply upgrading the operating system solve the problem