SocketException when running the solution about aspnetcore-app-workshop HOT 9 OPEN

Seems the URL the FrontEnd uses to speak to the BackEnd is misconfigured. Ensure that the BackEnd is listening on the URL you have configured for the FrontEnd (in the appsettings.json file of the FrontEnd project).

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I have a similar problem, but I have double checked my appsettings.json and launchsettings.json. Here is my stack trace:

An unhandled exception occurred while processing the request.
SocketException: No connection could be made because the target machine actively refused it

System.Net.Http.ConnectHelper.ConnectAsync(string host, int port, CancellationToken cancellationToken)
HttpRequestException: No connection could be made because the target machine actively refused it

System.Net.Http.ConnectHelper.ConnectAsync(string host, int port, CancellationToken cancellationToken)

SocketException: No connection could be made because the target machine actively refused it
System.Net.Http.ConnectHelper.ConnectAsync(string host, int port, CancellationToken cancellationToken)

HttpRequestException: No connection could be made because the target machine actively refused it

System.Net.Http.ConnectHelper.ConnectAsync(string host, int port, CancellationToken cancellationToken)
System.Threading.Tasks.ValueTask.get_Result()
System.Net.Http.HttpConnectionPool.CreateConnectionAsync(HttpRequestMessage request, CancellationToken cancellationToken)
System.Threading.Tasks.ValueTask.get_Result()
System.Net.Http.HttpConnectionPool.WaitForCreatedConnectionAsync(ValueTask<ValueTuple<HttpConnection, HttpResponseMessage>> creationTask)
System.Threading.Tasks.ValueTask.get_Result()
System.Net.Http.HttpConnectionPool.SendWithRetryAsync(HttpRequestMessage request, bool doRequestAuth, CancellationToken cancellationToken)
System.Net.Http.RedirectHandler.SendAsync(HttpRequestMessage request, CancellationToken cancellationToken)
Microsoft.Extensions.Http.Logging.LoggingHttpMessageHandler.SendAsync(HttpRequestMessage request, CancellationToken cancellationToken)
Microsoft.Extensions.Http.Logging.LoggingScopeHttpMessageHandler.SendAsync(HttpRequestMessage request, CancellationToken cancellationToken)
System.Net.Http.HttpClient.FinishSendAsyncBuffered(Task sendTask, HttpRequestMessage request, CancellationTokenSource cts, bool disposeCts)
FrontEnd.Services.ApiClient.GetSessionsAsync() in ApiClient.cs

var response = await _httpClient.GetAsync("/api/sessions");

FrontEnd.Pages.IndexModel.OnGet(int day) in Index.cshtml.cs

var sessions = await _apiClient.GetSessionsAsync();

Microsoft.AspNetCore.Mvc.RazorPages.Internal.ExecutorFactory+NonGenericTaskHandlerMethod.Execute(object receiver, object[] arguments)
Microsoft.AspNetCore.Mvc.RazorPages.Internal.PageActionInvoker.InvokeHandlerMethodAsync()
Microsoft.AspNetCore.Mvc.RazorPages.Internal.PageActionInvoker.InvokeNextPageFilterAsync()
Microsoft.AspNetCore.Mvc.RazorPages.Internal.PageActionInvoker.Rethrow(PageHandlerExecutedContext context)
Microsoft.AspNetCore.Mvc.RazorPages.Internal.PageActionInvoker.Next(ref State next, ref Scope scope, ref object state, ref bool isCompleted)
Microsoft.AspNetCore.Mvc.RazorPages.Internal.PageActionInvoker.InvokeInnerFilterAsync()
Microsoft.AspNetCore.Mvc.Internal.ResourceInvoker.InvokeNextResourceFilter()
Microsoft.AspNetCore.Mvc.Internal.ResourceInvoker.Rethrow(ResourceExecutedContext context)
Microsoft.AspNetCore.Mvc.Internal.ResourceInvoker.Next(ref State next, ref Scope scope, ref object state, ref bool isCompleted)
Microsoft.AspNetCore.Mvc.Internal.ResourceInvoker.InvokeFilterPipelineAsync()
Microsoft.AspNetCore.Mvc.Internal.ResourceInvoker.InvokeAsync()
Microsoft.AspNetCore.Routing.EndpointMiddleware.Invoke(HttpContext httpContext)
Microsoft.AspNetCore.Routing.EndpointRoutingMiddleware.Invoke(HttpContext httpContext)
Microsoft.AspNetCore.StaticFiles.StaticFileMiddleware.Invoke(HttpContext context)
Microsoft.AspNetCore.Diagnostics.DeveloperExceptionPageMiddleware.Invoke(HttpContext context)

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@jc184 Can you browse directly to the back end service URL listed in appsettings.json?

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This is my FrontEnd appsettings.json:

{
  "ServiceUrl": "http://localhost:50039/",
  "Logging": {
    "LogLevel": {
      "Default": "Warning"
    }
  },
  "AllowedHosts": "*"
}

and this is my BackEnd launchsettings.json:

{
  "$schema": "http://json.schemastore.org/launchsettings.json",
  "iisSettings": {
    "windowsAuthentication": false, 
    "anonymousAuthentication": true,
    "iisExpress": {
      "applicationUrl": "http://localhost:50039/",
      "sslPort": 44387
    }
  },
  "profiles": {
    "IIS Express": {
      "commandName": "IISExpress",
      "launchBrowser": true, 
      "environmentVariables": {
        "ASPNETCORE_ENVIRONMENT": "Development"
      }
    },
    "BackEnd": {
      "commandName": "Project",
      "launchBrowser": true,
      "launchUrl": "",
      "applicationUrl": "https://localhost:44387;http://localhost:50039",
      "environmentVariables": {
        "ASPNETCORE_ENVIRONMENT": "Development"
      }
    }
  }
}

Let me know if you spot any errors!

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Which URL do you use to browse to the back end when it works?

from aspnetcore-app-workshop.

I am getting also similar error..please anyone can help me to solve this problem.
@DamianEdwards @jc184 @jongalloway @MaherJendoubi @csharpfritz

An unhandled exception occurred while processing the request.

SocketException: No connection could be made because the target machine actively refused it.
System.Net.Http.ConnectHelper.ConnectAsync(string host, int port, CancellationToken cancellationToken)

HttpRequestException: No connection could be made because the target machine actively refused it.
System.Net.Http.ConnectHelper.ConnectAsync(string host, int port, CancellationToken cancellationToken)

SocketException: No connection could be made because the target machine actively refused it.
System.Net.Http.ConnectHelper.ConnectAsync(string host, int port, CancellationToken cancellationToken)

HttpRequestException: No connection could be made because the target machine actively refused it.
System.Net.Http.ConnectHelper.ConnectAsync(string host, int port, CancellationToken cancellationToken)
System.Threading.Tasks.ValueTask.get_Result()
System.Runtime.CompilerServices.ConfiguredValueTaskAwaitable+ConfiguredValueTaskAwaiter.GetResult()
System.Net.Http.HttpConnectionPool.ConnectAsync(HttpRequestMessage request, bool allowHttp2, CancellationToken cancellationToken)
System.Threading.Tasks.ValueTask.get_Result()
System.Runtime.CompilerServices.ConfiguredValueTaskAwaitable+ConfiguredValueTaskAwaiter.GetResult()
System.Net.Http.HttpConnectionPool.CreateHttp11ConnectionAsync(HttpRequestMessage request, CancellationToken cancellationToken)
System.Threading.Tasks.ValueTask.get_Result()
System.Runtime.CompilerServices.ConfiguredValueTaskAwaitable+ConfiguredValueTaskAwaiter.GetResult()
System.Net.Http.HttpConnectionPool.GetHttpConnectionAsync(HttpRequestMessage request, CancellationToken cancellationToken)
System.Threading.Tasks.ValueTask.get_Result()
System.Runtime.CompilerServices.ConfiguredValueTaskAwaitable+ConfiguredValueTaskAwaiter.GetResult()
System.Net.Http.HttpConnectionPool.SendWithRetryAsync(HttpRequestMessage request, bool doRequestAuth, CancellationToken cancellationToken)
System.Net.Http.RedirectHandler.SendAsync(HttpRequestMessage request, CancellationToken cancellationToken)
System.Net.Http.DiagnosticsHandler.SendAsync(HttpRequestMessage request, CancellationToken cancellationToken)
Microsoft.Extensions.Http.Logging.LoggingHttpMessageHandler.SendAsync(HttpRequestMessage request, CancellationToken cancellationToken)
Microsoft.Extensions.Http.Logging.LoggingScopeHttpMessageHandler.SendAsync(HttpRequestMessage request, CancellationToken cancellationToken)
System.Net.Http.HttpClient.FinishSendAsyncBuffered(Task sendTask, HttpRequestMessage request, CancellationTokenSource cts, bool disposeCts)

FrontEnd.Services.ApiClient.GetSessionsAsync() in ApiClient.cs

    return await response.Content.ReadAsAsync<SessionResponse>();
    }
    public async Task<List<SessionResponse>> GetSessionsAsync()
    {
         **var response = await _httpClient.GetAsync("/api/sessions");**
        response.EnsureSuccessStatusCode();
        return await response.Content.ReadAsAsync<List<SessionResponse>>();
    }

FrontEnd.Pages.IndexModel.OnGet(int day) in Index.cshtml.cs

    public int CurrentDayOffset { get; set; }
    public async Task OnGet(int day = 0)
    {
        CurrentDayOffset = day;
        **var sessions = await _apiClient.GetSessionsAsync();**
        var startDate = sessions.Min(s => s.StartTime?.Date);
        var offset = 0;
        DayOffsets = sessions.Select(s => s.StartTime?.Date)
                             .Distinct()

Microsoft.AspNetCore.Mvc.RazorPages.Infrastructure.ExecutorFactory+NonGenericTaskHandlerMethod.Execute(object receiver, object[] arguments)
Microsoft.AspNetCore.Mvc.RazorPages.Infrastructure.PageActionInvoker.InvokeHandlerMethodAsync()
Microsoft.AspNetCore.Mvc.RazorPages.Infrastructure.PageActionInvoker.InvokeNextPageFilterAsync()
Microsoft.AspNetCore.Mvc.RazorPages.Infrastructure.PageActionInvoker.Rethrow(PageHandlerExecutedContext context)
Microsoft.AspNetCore.Mvc.RazorPages.Infrastructure.PageActionInvoker.Next(ref State next, ref Scope scope, ref object state, ref bool isCompleted)
Microsoft.AspNetCore.Mvc.RazorPages.Infrastructure.PageActionInvoker.InvokeInnerFilterAsync()
Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.g__Awaited|24_0(ResourceInvoker invoker, Task lastTask, State next, Scope scope, object state, bool isCompleted)
Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.Rethrow(ResourceExecutedContextSealed context)
Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.Next(ref State next, ref Scope scope, ref object state, ref bool isCompleted)
Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.g__Awaited|19_0(ResourceInvoker invoker, Task lastTask, State next, Scope scope, object state, bool isCompleted)
Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.g__Awaited|17_0(ResourceInvoker invoker, Task task, IDisposable scope)
Microsoft.AspNetCore.Routing.EndpointMiddleware.g__AwaitRequestTask|6_0(Endpoint endpoint, Task requestTask, ILogger logger)
Microsoft.AspNetCore.Authorization.AuthorizationMiddleware.Invoke(HttpContext context)
Microsoft.AspNetCore.Diagnostics.DeveloperExceptionPageMiddleware.Invoke(HttpContext context)

This is my FrontEnd appsettings.json:
{
"ServiceUrl": "https://localhost:5001/",

"Logging": {
"LogLevel": {
"Default": "Information",
"Microsoft": "Warning",
"Microsoft.Hosting.Lifetime": "Information"
}
},
"AllowedHosts": "*"
}

and this is my BackEnd launchsettings.json:

{
"iisSettings": {
"windowsAuthentication": false,
"anonymousAuthentication": true,
"iisExpress": {
"applicationUrl": "http://localhost:26936",
"sslPort": 44305
}
},
"$schema": "http://json.schemastore.org/launchsettings.json",
"profiles": {
"IIS Express": {
"commandName": "IISExpress",
"launchBrowser": true,
"environmentVariables": {
"ASPNETCORE_ENVIRONMENT": "Development"
}
},
"BackEnd": {
"commandName": "Project",
"launchBrowser": true,
"environmentVariables": {
"ASPNETCORE_ENVIRONMENT": "Development"
},
"applicationUrl": "https://localhost:5001;http://localhost:5000"
}
}
}

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I am having a challenge similar to what is listed above. Does anyone please have a good solution??? Kindly help ASAP!!!

from aspnetcore-app-workshop.

for this challenge. i set my lauchsetting for frontend like this

"FrontEnd": {
"commandName": "Project",
"launchBrowser": true,
"environmentVariables": {
"ASPNETCORE_ENVIRONMENT": "Development"
},
"applicationUrl": "http://localhost:55994", // didnt use https
"sslPort": 44374
}
}

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