api - .NET Core issue: System.OperationCanceledException when hosted in IIS

Question

My program.cs file in .NET Core 3.1 is like this I am creating web API in .net core but I am getting this error when hosted on server in IIS. API is working fine when hosted locally.

public class Program
    {
        public static void Main(string[] args)
        {
           
 var logger = NLogBuilder.ConfigureNLog(String.Concat(Directory.GetCurrentDirectory(), "/nlog.config")).GetLogger();
            CreateHostBuilder(args).Build().Run();
        
}

        public static  IHostBuilder CreateHostBuilder(string[] args) =>
            Host.CreateDefaultBuilder(args)
            
                .ConfigureWebHostDefaults(webBuilder =>
                {
                    webBuilder.UseStartup<Startup>();
                }).ConfigureLogging(logging =>
                {
                    logging.ClearProviders();
                    logging.SetMinimumLevel(Microsoft.Extensions.Logging.LogLevel.Trace);
                })
              .UseNLog();
    }

System.OperationCanceledException: at program.cs error

I am getting this error with stack trace like:

Description: The process was terminated due to an unhandled exception.
Exception Info: System.OperationCanceledException: The operation was canceled.
   at System.Threading.CancellationToken.ThrowOperationCanceledException()
   at System.Threading.CancellationToken.ThrowIfCancellationRequested()
   at Microsoft.Extensions.Hosting.Internal.Host.StopAsync(CancellationToken

cancellationToken) at Microsoft.Extensions.Hosting.HostingAbstractionsHostExtensions.WaitForShutdownAsync(IHost host, CancellationToken token) at Microsoft.Extensions.Hosting.HostingAbstractionsHostExtensions.RunAsync(IHost host, CancellationToken token) at Microsoft.Extensions.Hosting.HostingAbstractionsHostExtensions.RunAsync(IHost host, CancellationToken token) at Microsoft.Extensions.Hosting.HostingAbstractionsHostExtensions.Run(IHost host)

What is wrong here?

question from:https://stackoverflow.com/questions/65914212/net-core-issue-system-operationcanceledexception-when-hosted-in-iis

Answer 1

I am experiencing the same error, and I was trying to see what might cause it.

I came across this link with the same issue

and the thing that jumped out at me was the "non-graceful shutdown". To test, I recycled the application website on IIS, which did not trigger the error. I then tried turning off the app pool via IIS, and DID trigger the exception. This leads me to believe it has something to do with a task running inside the application that is cut short when the non-graceful shutdown occurs. In my case, I have a HostedService running in the background of my application, do you have something similar in yours?