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Can not configure a port for Fiddler

I am using Fiddler 1.5.1 in Windows 10 version 1909.

The application has been launched.

But I could not save the connection port.

The save button hangs


Could you attach your application log files? You could find them using the `Help - Open Application Logs Folder` menu.

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attaching logs

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attaching logs

log
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[2021-03-24 14:18:44:706] [Error] [NETCore] Unexpected backend error.

System.Threading.Tasks.TaskCanceledException: The operation was canceled.

   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.AuthenticationHelper.SendWithAuthAsync(HttpRequestMessage request, Uri authUri, ICredentials credentials, Boolean preAuthenticate, Boolean isProxyAuth, Boolean doRequestAuth, HttpConnectionPool pool, CancellationToken cancellationToken)

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

   at Microsoft.Extensions.Http.Logging.LoggingHttpMessageHandler.SendAsync(HttpRequestMessage request, CancellationToken cancellationToken)

   at Polly.Retry.AsyncRetryEngine.ImplementationAsync[TResult](Func`3 action, Context context, CancellationToken cancellationToken, ExceptionPredicates shouldRetryExceptionPredicates, ResultPredicates`1 shouldRetryResultPredicates, Func`5 onRetryAsync, Int32 permittedRetryCount, IEnumerable`1 sleepDurationsEnumerable, Func`4 sleepDurationProvider, Boolean continueOnCapturedContext)

   at Polly.AsyncPolicy`1.ExecuteAsync(Func`3 action, Context context, CancellationToken cancellationToken, Boolean continueOnCapturedContext)

   at Polly.Wrap.AsyncPolicyWrapEngine.<>c__DisplayClass0_0`1.<<ImplementationAsync>b__0>d.MoveNext()

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

   at Polly.Fallback.AsyncFallbackEngine.ImplementationAsync[TResult](Func`3 action, Context context, CancellationToken cancellationToken, ExceptionPredicates shouldHandleExceptionPredicates, ResultPredicates`1 shouldHandleResultPredicates, Func`3 onFallbackAsync, Func`4 fallbackAction, Boolean continueOnCapturedContext)

   at Polly.AsyncPolicy`1.ExecuteAsync(Func`3 action, Context context, CancellationToken cancellationToken, Boolean continueOnCapturedContext)

   at Polly.Wrap.AsyncPolicyWrapEngine.ImplementationAsync[TResult](Func`3 func, Context context, CancellationToken cancellationToken, Boolean continueOnCapturedContext, IAsyncPolicy`1 outerPolicy, IAsyncPolicy`1 innerPolicy)

   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.FinishSendAsyncBuffered(Task`1 sendTask, HttpRequestMessage request, CancellationTokenSource cts, Boolean disposeCts)

   at FiddlerBackendSDK.Core.Http.Client.AuthenticatedHttpClient.<>c__DisplayClass10_0`1.<<GetAsync>b__0>d.MoveNext()

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

   at FiddlerBackendSDK.Core.Http.Client.AuthenticatedHttpClient.ExecuteWithValidTokenAsync(Func`1 action)

   at FiddlerBackendSDK.Core.Http.Client.AuthenticatedHttpClient.GetAsync[T](String requestUri, IFiddlerHttpStatusCodeValidator statusCodeValidator, IEnumerable`1 headers)

   at FiddlerBackendSDK.Core.Http.Client.AuthenticatedHttpClient.GetAsync[T](String requestUri, IFiddlerHttpStatusCodeValidator statusCodeValidator)

   at FiddlerBackendSDK.User.UserClient.GetCurrentUserAsync()

   at Fiddler.WebUi.Services.Backend.BackendService.SetUserInfo() in c:\Jenkins\workspace\fiddler-build-release-win\Fiddler\WebUi\Fiddler.WebUi\Services\Backend\BackendService.cs:line 853

   at Fiddler.WebUi.Services.Backend.BackendService.<>c__DisplayClass47_0.<<Login>b__0>d.MoveNext() in c:\Jenkins\workspace\fiddler-build-release-win\Fiddler\WebUi\Fiddler.WebUi\Services\Backend\BackendService.cs:line 468

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

   at Fiddler.WebUi.Services.Backend.BackendService.ExecuteWithSdkErrorsHandling(Func`1 action) in c:\Jenkins\workspace\fiddler-build-release-win\Fiddler\WebUi\Fiddler.WebUi\Services\Backend\BackendService.cs:line 726

[2021-03-24 14:18:44:716] [Error] [NETCore] Failed to invoke hub method 'Login'.

Microsoft.AspNetCore.SignalR.HubException: Unexpected backend error.

   at Fiddler.WebUi.Services.Backend.BackendService.ExecuteWithSdkErrorsHandling(Func`1 action) in c:\Jenkins\workspace\fiddler-build-release-win\Fiddler\WebUi\Fiddler.WebUi\Services\Backend\BackendService.cs:line 747

   at Fiddler.WebUi.Services.Backend.BackendService.Login(String apiUrl, String paymentUrl, String idToken) in c:\Jenkins\workspace\fiddler-build-release-win\Fiddler\WebUi\Fiddler.WebUi\Services\Backend\BackendService.cs:line 431

   at Fiddler.WebUi.Services.Users.UsersService.Login(String apiUrl, String paymentUrl, String idToken, String userId, String[] oldUserIds, String userIdForSettings) in c:\Jenkins\workspace\fiddler-build-release-win\Fiddler\WebUi\Fiddler.WebUi\Services\Users\UsersService.cs:line 113

   at Fiddler.WebUi.Hubs.FiddlerHub.Login(String apiUrl, String paymentUrl, String idToken, String userId, String[] oldUserIds, String userIdForSettings) in c:\Jenkins\workspace\fiddler-build-release-win\Fiddler\WebUi\Fiddler.WebUi\Hubs\FiddlerHub.Users.cs:line 17

   at Microsoft.AspNetCore.SignalR.Internal.DefaultHubDispatcher`1.ExecuteHubMethod(ObjectMethodExecutor methodExecutor, THub hub, Object[] arguments)

   at Microsoft.AspNetCore.SignalR.Internal.DefaultHubDispatcher`1.<>c__DisplayClass13_0.<<Invoke>g__ExecuteInvocation|0>d.MoveNext()

[2021-03-24 14:18:44:738] [Information] [Angular] Backend login failed.

[2021-03-24 14:18:44:743] [Error] [NETCore] Unexpected backend error.

System.NullReferenceException: Object reference not set to an instance of an object.

   at Fiddler.WebUi.Services.Backend.BackendService.<IsTrialAvailable>b__12_0() in c:\Jenkins\workspace\fiddler-build-release-win\Fiddler\WebUi\Fiddler.WebUi\Services\Backend\BackendService.cs:line 49

   at Fiddler.WebUi.Services.Backend.BackendService.ExecuteWithSdkErrorsHandling[T](Func`1 action) in c:\Jenkins\workspace\fiddler-build-release-win\Fiddler\WebUi\Fiddler.WebUi\Services\Backend\BackendService.cs:line 696

[2021-03-24 14:18:44:745] [Error] [NETCore] Failed to invoke hub method 'IsTrialAvailable'.

Microsoft.AspNetCore.SignalR.HubException: Unexpected backend error.

   at Fiddler.WebUi.Services.Backend.BackendService.ExecuteWithSdkErrorsHandling[T](Func`1 action) in c:\Jenkins\workspace\fiddler-build-release-win\Fiddler\WebUi\Fiddler.WebUi\Services\Backend\BackendService.cs:line 718

   at Fiddler.WebUi.Services.Backend.BackendService.IsTrialAvailable() in c:\Jenkins\workspace\fiddler-build-release-win\Fiddler\WebUi\Fiddler.WebUi\Services\Backend\BackendService.cs:line 47

   at Fiddler.WebUi.Hubs.FiddlerHub.IsTrialAvailable() in c:\Jenkins\workspace\fiddler-build-release-win\Fiddler\WebUi\Fiddler.WebUi\Hubs\FiddlerHub.License.cs:line 47

   at lambda_method(Closure , Object )

   at Microsoft.Extensions.Internal.ObjectMethodExecutorAwaitable.Awaiter.GetResult()

   at Microsoft.AspNetCore.SignalR.Internal.DefaultHubDispatcher`1.ExecuteHubMethod(ObjectMethodExecutor methodExecutor, THub hub, Object[] arguments)

   at Microsoft.AspNetCore.SignalR.Internal.DefaultHubDispatcher`1.<>c__DisplayClass13_0.<<Invoke>g__ExecuteInvocation|0>d.MoveNext()

[2021-03-24 14:18:44:874] [Error] [NETCore] Could not find file 'C:\Users\1013219\.fiddler\6731870c-dda0-4295-a31d-6e9dcf5373f0\Settings\appsettings.json'.

System.IO.FileNotFoundException: Could not find file 'C:\Users\1013219\.fiddler\6731870c-dda0-4295-a31d-6e9dcf5373f0\Settings\appsettings.json'.


1 person likes this

Thanks for the quick update!


It seems that the errors are really the same as the ones in this thread: https://community.getfiddler.com/support/discussions/topics/12000026595


We are still investigating the issue, but could you try opening https://dashboard.getfiddler.com/ and sign in using the same user?


Fiddler Everywhere has a few network access requirements for `getfiddler.com` subdomains and missing some of them could lead to such errors.

I could not visit https://dashboard.getfiddler.com/ from the machine.


Even though with a fiddler account, have the same issue.

Could not reach https://dashboard.getfiddler.com/ from my machine.


Even though with a fiddler account, the same issue persist.

Thanks for the suggestions.


I have used the fiddler account but still the issue.

One more update. Regarding the network requirement, see


    https://login.getfiddler.com/ --- Yes
    https://api.getfiddler.com/ ---- Yes
    https://auth.getfiddler.com/ --- Yes
    https://amazonaws.com/ --- No

Hey Vashnuatadoor,



Although you can manually access the getfiddler.com endpoints, it looks like timeouts cause the issue to those very same APIs. You could try to resolve the issue by temporarily switching your active internet connection with an alternative one (for example, with a WiFI hotspot).


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