dotnet core 3.1 IIS Error "An attempt was made to access a socket in a way forbidden by its access permissions (10013)"

Question

I've dotnet core 3.1 project. I launched a few machines on iis. But today i can't launched the app on iis. I can launch with "dotnet <app.dll>" command and everything's good. But when i launch on IIS, it gives this error.

"crit: Microsoft.AspNetCore.Server.Kestrel[0] Unable to start Kestrel. System.Net.Sockets.SocketException (10013): An attempt was made to access a socket in a way forbidden by its access permissions. at System.Net.Sockets.Socket.UpdateStatusAfterSocketErrorAndThrowException(SocketError error, String callerName)"

Any suggestion ?

PS: I checked my ports in use with command netstat -o. There is no using from any application

stackoverflow.com/questions/68272081/… Sounds like the same issue. — Lex Li
It may be caused by a firewall, you can try to disable the firewall and try again. — samwu
Customer is using Windows Defender. I tried when Defender closed but nothing happened. App is running with dotnet command correctly but didnt work on iis — Hasan Özkaynak
You can try to use netsh interface ipv4 show excludedportrange protocol=tcp to list the reserved ranges. — samwu

Hasan Özkaynak Hasan Özkaynak · Accepted Answer · 2021-07-29T13:44:22

Finally I found my solution on my own. I removed UseKestrel() line from program.cs and everything's good.

        var config = new ConfigurationBuilder().AddCommandLine(args).Build();

       return  Host.CreateDefaultBuilder(args)
            .ConfigureWebHostDefaults(webBuilder =>
            {
                webBuilder.UseStartup<Startup>();
                webBuilder.UseKestrel(); **//remove this line.**
                webBuilder.UseUrls();
                webBuilder.UseIISIntegration();
                
            }).ConfigureServices((context, services) =>
            {
                services.AddHostedService<Worker>();
                services.AddHostedService<MonitorWorker>();
                services.AddHostedService<TransferWorker>();
            });

    }

dotnet core 3.1 IIS Error "An attempt was made to access a socket in a way forbidden by its access permissions (10013)"

2 Answers