Kestrelhttpserver: EADDRINUSE address already in use

[fanadd]

Hello Microsoft, I've just tried to launch ASP.NET application sample from official docs using Ubuntu Linux 14.04 subsystem for Windows 10 and came across the following issue with Kestrel:

Unhandled Exception: System.AggregateException: One or more errors occurred. (Error -98 EADDRINUSE address already in use) ---> Microsoft.AspNetCore.Server.Kestrel.Internal.Networking.UvException: Error -98 EADDRINUSE address already in use
   at Microsoft.AspNetCore.Server.Kestrel.Internal.Networking.Libuv.Check(Int32 statusCode)
   at Microsoft.AspNetCore.Server.Kestrel.Internal.Networking.UvTcpHandle.GetSockIPEndPoint()
   at Microsoft.AspNetCore.Server.Kestrel.Internal.Http.TcpListenerPrimary.CreateListenSocket()
   at Microsoft.AspNetCore.Server.Kestrel.Internal.Http.Listener.<>c.<StartAsync>b__6_0(Object state)
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at Microsoft.AspNetCore.Server.Kestrel.Internal.Http.ListenerPrimary.<StartAsync>d__11.MoveNext()
   --- End of inner exception stack trace ---
   at System.Threading.Tasks.Task.ThrowIfExceptional(Boolean includeTaskCanceledExceptions)
   at System.Threading.Tasks.Task.Wait(Int32 millisecondsTimeout, CancellationToken cancellationToken)
   at Microsoft.AspNetCore.Server.Kestrel.Internal.KestrelEngine.CreateServer(ServerAddress address)
   at Microsoft.AspNetCore.Server.Kestrel.KestrelServer.Start[TContext](IHttpApplication`1 application)
   at Microsoft.AspNetCore.Hosting.Internal.WebHost.Start()
   at Microsoft.AspNetCore.Hosting.WebHostExtensions.Run(IWebHost host, CancellationToken token, String shutdownMessage)
   at Microsoft.AspNetCore.Hosting.WebHostExtensions.Run(IWebHost host)
   at aspnetcoreapp.Program.Main(String[] args)

Here's app sources and some compiled binaries for it:
Bloge.zip

Windows 10 1607 (Build 14393.10)
Linux Ubuntu 14.04.5 LTS

[Tratcher]

The port you tried to listen on was already in use. Did you try another one?

[fanadd]

Yes. Changing port number using UseUrls() method had no effect on it. Default port number (5000) did't work too.

[cesarblum]

I can repro. Investigating.

[cesarblum]

@fanadd You're hitting a known issue: https://github.com/Microsoft/BashOnWindows/issues/68

You can work around it by listening on 127.0.0.1 or [::1] (but not both - fails with the same error).

[rexebin]

@cesarbs How do I make the change and listen to 127.0.0.1 please?

[gregorybleiker]

dotnet run --server.urls http://127.0.0.1:5000

[cesarblum]

@rexebin Just pass it to UseUrls when building the host, along with the port you want to bind to:

var host = new WebHostBuilder()
    ...
    .UseUrls("http://127.0.0.1:8080", ...)
    ...

[skorunka]

Tak a look in Task Explorrer if there is not any other instance of your project running. If so, end it and try again.

[rmit-s3614151-carol-saldanha]

Kill all the tasks with .net and Visual Studio and this should work. For Mac users, go to Activity Monitor -> dotnet ->Memory -> Quit