ASP.NET Core 2.1 Preview 2 Angular CLI App is not starting on debug mode #85

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fergalmoran · 2025-08-09T17:14:57Z

fergalmoran commented

2025-08-09 17:14:57 +00:00

Originally created by @TanvirArjel on 4/23/2018

I have created an app selecting template angular with asp.net core 2.1 preview2-final on visual studio 2017 Version 15.6.6 . It runs gracefully without debug mode but does not run anyway on debug mode..It continuously showing the following exception :

TimeoutException: The Angular CLI process did not start listening for requests within the timeout period of 50 seconds. Check the log output for error information.
Microsoft.AspNetCore.SpaServices.Extensions.Util.TaskTimeoutExtensions.WithTimeout<T>(Task<T> task, TimeSpan timeoutDelay, string message)

TimeoutException: The Angular CLI process did not start listening for requests within the timeout period of 50 seconds. Check the log output for error information.
Microsoft.AspNetCore.SpaServices.Extensions.Util.TaskTimeoutExtensions.WithTimeout<T>(Task<T> task, TimeSpan timeoutDelay, string message)
Microsoft.AspNetCore.SpaServices.Extensions.Proxy.SpaProxy.PerformProxyRequest(HttpContext context, HttpClient httpClient, Task<Uri> baseUriTask, CancellationToken applicationStoppingToken, bool proxy404s)
Microsoft.AspNetCore.Builder.SpaProxyingExtensions+<>c__DisplayClass2_0+<<UseProxyToSpaDevelopmentServer>b__0>d.MoveNext()
Microsoft.AspNetCore.Builder.RouterMiddleware.Invoke(HttpContext httpContext)
Microsoft.AspNetCore.StaticFiles.StaticFileMiddleware.Invoke(HttpContext context)
Microsoft.AspNetCore.Diagnostics.DeveloperExceptionPageMiddleware.Invoke(HttpContext context)

I have tried with changing the startup timeout value as follows but no luck:

app.UseSpa(spa =>
            {
                spa.Options.SourcePath = "ClientApp";

                if (env.IsDevelopment())
                {
                    spa.Options.StartupTimeout = new TimeSpan.FromSeconds(120);
                    spa.UseAngularCliServer(npmScript: "start");
                }
            });

*Originally created by @TanvirArjel on 4/23/2018* I have created an app selecting template angular with asp.net core 2.1 preview2-final on visual studio 2017 Version 15.6.6 . It runs gracefully without debug mode but does not run anyway on debug mode..It continuously showing the following exception : ``` TimeoutException: The Angular CLI process did not start listening for requests within the timeout period of 50 seconds. Check the log output for error information. Microsoft.AspNetCore.SpaServices.Extensions.Util.TaskTimeoutExtensions.WithTimeout<T>(Task<T> task, TimeSpan timeoutDelay, string message) ``` ``` TimeoutException: The Angular CLI process did not start listening for requests within the timeout period of 50 seconds. Check the log output for error information. Microsoft.AspNetCore.SpaServices.Extensions.Util.TaskTimeoutExtensions.WithTimeout<T>(Task<T> task, TimeSpan timeoutDelay, string message) Microsoft.AspNetCore.SpaServices.Extensions.Proxy.SpaProxy.PerformProxyRequest(HttpContext context, HttpClient httpClient, Task<Uri> baseUriTask, CancellationToken applicationStoppingToken, bool proxy404s) Microsoft.AspNetCore.Builder.SpaProxyingExtensions+<>c__DisplayClass2_0+<<UseProxyToSpaDevelopmentServer>b__0>d.MoveNext() Microsoft.AspNetCore.Builder.RouterMiddleware.Invoke(HttpContext httpContext) Microsoft.AspNetCore.StaticFiles.StaticFileMiddleware.Invoke(HttpContext context) Microsoft.AspNetCore.Diagnostics.DeveloperExceptionPageMiddleware.Invoke(HttpContext context) ``` I have tried with changing the startup timeout value as follows but no luck: ``` app.UseSpa(spa => { spa.Options.SourcePath = "ClientApp"; if (env.IsDevelopment()) { spa.Options.StartupTimeout = new TimeSpan.FromSeconds(120); spa.UseAngularCliServer(npmScript: "start"); } }); ```

fergalmoran closed this issue

2025-08-09 17:14:57 +00:00

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Reference: github/JavaScriptServices#85