Aspire 9 fails to stop projects

[yoDon]

Is there an existing issue for this?

• I have searched the existing issues

Describe the bug

Aspire 9 seems to have lots of problems stopping projects.

In Aspire 8, I routinely started and stopped solutions without issue.

In Aspire 9 on OSX with Podman Desktop and the Rider Aspire plugin, about half the time there are stuck ports preventing Aspire projects from running correctly. I don't know about other operating systems.

All of this is somewhat anecdotal, as I don't have a repro that happens every time, I just know I commonly have the problem. That said, I think closing open browser tabs from the previous session may reduce the incidence of this issue (that was not required with Aspire 8).

Expected Behavior

Starting, stopping, and restarting Aspire projects should "just work", including regardless of whether there are browser tabs left open from a previous run.

Steps To Reproduce

No response

Exceptions (if any)

No response

.NET Version info

IMPORTANT NOTE: I'm running via JetBrains Rider 2024.3 Build #RD-243.21565.191 on OSX, which I believe contains its own dotnet that doesn't show up using dotnet --info.

That said, here is my dotnet --info:

.NET SDK:
Version: 8.0.201
Commit: 4c2d78f037
Workload version: 8.0.200-manifests.2772ffde

Runtime Environment:
OS Name: Mac OS X
OS Version: 14.6
OS Platform: Darwin
RID: osx-arm64
Base Path: /usr/local/share/dotnet/sdk/8.0.201/

.NET workloads installed:
[aspire]
Installation Source: SDK 8.0.200
Manifest Version: 8.2.1/8.0.100
Manifest Path: /usr/local/share/dotnet/sdk-manifests/8.0.100/microsoft.net.sdk.aspire/8.2.1/WorkloadManifest.json
Install Type: FileBased

Host:
Version: 8.0.4
Architecture: arm64
Commit: 2d7eea2529

.NET SDKs installed:
6.0.401 [/usr/local/share/dotnet/sdk]
6.0.403 [/usr/local/share/dotnet/sdk]
6.0.404 [/usr/local/share/dotnet/sdk]
6.0.405 [/usr/local/share/dotnet/sdk]
6.0.407 [/usr/local/share/dotnet/sdk]
6.0.408 [/usr/local/share/dotnet/sdk]
6.0.410 [/usr/local/share/dotnet/sdk]
6.0.413 [/usr/local/share/dotnet/sdk]
6.0.415 [/usr/local/share/dotnet/sdk]
7.0.100 [/usr/local/share/dotnet/sdk]
7.0.101 [/usr/local/share/dotnet/sdk]
7.0.102 [/usr/local/share/dotnet/sdk]
7.0.202 [/usr/local/share/dotnet/sdk]
7.0.203 [/usr/local/share/dotnet/sdk]
7.0.304 [/usr/local/share/dotnet/sdk]
7.0.307 [/usr/local/share/dotnet/sdk]
7.0.410 [/usr/local/share/dotnet/sdk]
8.0.100 [/usr/local/share/dotnet/sdk]
8.0.201 [/usr/local/share/dotnet/sdk]

.NET runtimes installed:
Microsoft.AspNetCore.App 6.0.9 [/usr/local/share/dotnet/shared/Microsoft.AspNetCore.App]
Microsoft.AspNetCore.App 6.0.11 [/usr/local/share/dotnet/shared/Microsoft.AspNetCore.App]
Microsoft.AspNetCore.App 6.0.12 [/usr/local/share/dotnet/shared/Microsoft.AspNetCore.App]
Microsoft.AspNetCore.App 6.0.13 [/usr/local/share/dotnet/shared/Microsoft.AspNetCore.App]
Microsoft.AspNetCore.App 6.0.15 [/usr/local/share/dotnet/shared/Microsoft.AspNetCore.App]
Microsoft.AspNetCore.App 6.0.16 [/usr/local/share/dotnet/shared/Microsoft.AspNetCore.App]
Microsoft.AspNetCore.App 6.0.18 [/usr/local/share/dotnet/shared/Microsoft.AspNetCore.App]
Microsoft.AspNetCore.App 6.0.21 [/usr/local/share/dotnet/shared/Microsoft.AspNetCore.App]
Microsoft.AspNetCore.App 6.0.23 [/usr/local/share/dotnet/shared/Microsoft.AspNetCore.App]
Microsoft.AspNetCore.App 7.0.0 [/usr/local/share/dotnet/shared/Microsoft.AspNetCore.App]
Microsoft.AspNetCore.App 7.0.1 [/usr/local/share/dotnet/shared/Microsoft.AspNetCore.App]
Microsoft.AspNetCore.App 7.0.2 [/usr/local/share/dotnet/shared/Microsoft.AspNetCore.App]
Microsoft.AspNetCore.App 7.0.4 [/usr/local/share/dotnet/shared/Microsoft.AspNetCore.App]
Microsoft.AspNetCore.App 7.0.5 [/usr/local/share/dotnet/shared/Microsoft.AspNetCore.App]
Microsoft.AspNetCore.App 7.0.7 [/usr/local/share/dotnet/shared/Microsoft.AspNetCore.App]
Microsoft.AspNetCore.App 7.0.10 [/usr/local/share/dotnet/shared/Microsoft.AspNetCore.App]
Microsoft.AspNetCore.App 7.0.20 [/usr/local/share/dotnet/shared/Microsoft.AspNetCore.App]
Microsoft.AspNetCore.App 8.0.0 [/usr/local/share/dotnet/shared/Microsoft.AspNetCore.App]
Microsoft.AspNetCore.App 8.0.2 [/usr/local/share/dotnet/shared/Microsoft.AspNetCore.App]
Microsoft.NETCore.App 6.0.9 [/usr/local/share/dotnet/shared/Microsoft.NETCore.App]
Microsoft.NETCore.App 6.0.11 [/usr/local/share/dotnet/shared/Microsoft.NETCore.App]
Microsoft.NETCore.App 6.0.12 [/usr/local/share/dotnet/shared/Microsoft.NETCore.App]
Microsoft.NETCore.App 6.0.13 [/usr/local/share/dotnet/shared/Microsoft.NETCore.App]
Microsoft.NETCore.App 6.0.15 [/usr/local/share/dotnet/shared/Microsoft.NETCore.App]
Microsoft.NETCore.App 6.0.16 [/usr/local/share/dotnet/shared/Microsoft.NETCore.App]
Microsoft.NETCore.App 6.0.18 [/usr/local/share/dotnet/shared/Microsoft.NETCore.App]
Microsoft.NETCore.App 6.0.21 [/usr/local/share/dotnet/shared/Microsoft.NETCore.App]
Microsoft.NETCore.App 6.0.23 [/usr/local/share/dotnet/shared/Microsoft.NETCore.App]
Microsoft.NETCore.App 7.0.0 [/usr/local/share/dotnet/shared/Microsoft.NETCore.App]
Microsoft.NETCore.App 7.0.1 [/usr/local/share/dotnet/shared/Microsoft.NETCore.App]
Microsoft.NETCore.App 7.0.2 [/usr/local/share/dotnet/shared/Microsoft.NETCore.App]
Microsoft.NETCore.App 7.0.4 [/usr/local/share/dotnet/shared/Microsoft.NETCore.App]
Microsoft.NETCore.App 7.0.5 [/usr/local/share/dotnet/shared/Microsoft.NETCore.App]
Microsoft.NETCore.App 7.0.7 [/usr/local/share/dotnet/shared/Microsoft.NETCore.App]
Microsoft.NETCore.App 7.0.10 [/usr/local/share/dotnet/shared/Microsoft.NETCore.App]
Microsoft.NETCore.App 7.0.20 [/usr/local/share/dotnet/shared/Microsoft.NETCore.App]
Microsoft.NETCore.App 8.0.0 [/usr/local/share/dotnet/shared/Microsoft.NETCore.App]
Microsoft.NETCore.App 8.0.2 [/usr/local/share/dotnet/shared/Microsoft.NETCore.App]
Microsoft.NETCore.App 8.0.4 [/usr/local/share/dotnet/shared/Microsoft.NETCore.App]

Other architectures found:
x64 [/usr/local/share/dotnet/x64]

Environment variables:
Not set

global.json file:
/Users/........./global.json

Learn more:
https://aka.ms/dotnet/info

Download .NET:
https://aka.ms/dotnet/download

Anything else?

No response

[yoDon]

Adding sample exceptions:

fail: Aspire.Hosting.Dcp.dcpctrl.ServiceReconciler[0]
      could not start the proxy {"ServiceName": {"name":"aspnetcore_project01"}, "Reconciliation": 4, "error": "could not start the proxy for the service: listen tcp [::1]:5263: bind: address already in use"}
fail: Aspire.Hosting.Dcp.dcpctrl.ServiceReconciler[0]
      could not start the proxy {"ServiceName": {"name":"aspnetcore_project03-http"}, "Reconciliation": 5, "error": "could not start the proxy for the service: listen tcp [::1]:5236: bind: address already in use"}
fail: Aspire.Hosting.Dcp.dcpctrl.ServiceReconciler[0]
      could not start the proxy {"ServiceName": {"name":"aspnetcore_project02-http"}, "Reconciliation": 12, "error": "could not start the proxy for the service: listen tcp [::1]:5019: bind: address already in use"}
fail: Aspire.Hosting.Dcp.dcpctrl.ServiceReconciler[0]
      could not start the proxy {"ServiceName": {"name":"yarp"}, "Reconciliation": 29, "error": "could not start the proxy for the service: listen tcp [::1]:6001: bind: address already in use"}
fail: Aspire.Hosting.Dcp.dcpctrl.ServiceReconciler[0]
      could not start the proxy {"ServiceName": {"name":"aspnetcore_project01"}, "Reconciliation": 30, "error": "could not start the proxy for the service: listen tcp [::1]:5263: bind: address already in use"}
fail: Aspire.Hosting.Dcp.dcpctrl.ServiceReconciler[0]
      could not start the proxy {"ServiceName": {"name":"aspnetcore_project02-http"}, "Reconciliation": 31, "error": "could not start the proxy for the service: listen tcp [::1]:5019: bind: address already in use"}
...

and

fail: Aspire.Hosting.Dashboard.Microsoft.Extensions.Hosting.Internal.Host[11]
      Hosting failed to start
      System.IO.IOException: Failed to bind to address http://127.0.0.1:15071: address already in use.
       ---> Microsoft.AspNetCore.Connections.AddressInUseException: Address already in use
       ---> System.Net.Sockets.SocketException (48): Address already in use
         at System.Net.Sockets.Socket.DoBind(EndPoint endPointSnapshot, SocketAddress socketAddress)
         at System.Net.Sockets.Socket.Bind(EndPoint localEP)
         at Microsoft.AspNetCore.Server.Kestrel.Transport.Sockets.SocketTransportOptions.CreateDefaultBoundListenSocket(EndPoint endpoint)
         at Microsoft.AspNetCore.Server.Kestrel.Transport.Sockets.SocketConnectionListener.Bind()
         --- End of inner exception stack trace ---
         at Microsoft.AspNetCore.Server.Kestrel.Transport.Sockets.SocketConnectionListener.Bind()
         at Microsoft.AspNetCore.Server.Kestrel.Transport.Sockets.SocketTransportFactory.BindAsync(EndPoint endpoint, CancellationToken cancellationToken)
         at Microsoft.AspNetCore.Server.Kestrel.Core.Internal.Infrastructure.TransportManager.BindAsync(EndPoint endPoint, ConnectionDelegate connectionDelegate, EndpointConfig endpointConfig, CancellationToken cancellationToken)
         at Microsoft.AspNetCore.Server.Kestrel.Core.KestrelServerImpl.<>c__DisplayClass28_0`1.<<StartAsync>g__OnBind|0>d.MoveNext()
      --- End of stack trace from previous location ---

[jack775544]

A coworker of mine has been getting similar issues. In that case they were running an ARM MacOS (not sure of the OS version right now) device and starting the app host using dotnet run from the command line.

Upon stopping and starting the app host, all the C# projects were failing to start since the ports were already in use.

[tjementum]

I have the same issue. It seems like the Developer Control Pane takes up to 1 minute to shut down. I made an ugly hack to find and kill any hanging control pane as the first step when starting the AppHost.

See this commit: platformplatform/PlatformPlatform@1772f94

[yoDon]

If you are impacted by this, it MAY help to edit your AppHost/Properties/launchSettings.json file between debugger runs to change the Dashboard port number between launches (I bump the port number up or down by 1 each time).

This gives the Dashboard extra time to reset (others have reported the Dashboard is the worst/longest duration stuck port offender here).

If you have multiple other projects also getting stuck, this unfortunately won't unblock the others.

[tjementum]

others have reported the Dashboard is the worst/longest duration stuck port offender here

That’s what I see too. If I restart before the DCP process is ready, it sometimes takes more than a 1 minute to release the ports... but if you wait 10–15 seconds before starting, it almost always releases. In Aspire 8.2, this used to be 3-5 seconds, and in Aspire 8.0 this was not a problem at all.

The code below works for me (only tested on macOS). The only problem is that the browser starts immediately, and the dashboard is not properly shown until I manually hit refresh.

using System.Diagnostics;
using AppHost;
using Projects;

// Detect if Aspire ports from the previous run are released. See https://github.com/dotnet/aspire/issues/6704
EnsureDeveloperControlPaneIsNotRunning();

var builder = DistributedApplication.CreateBuilder(args);

// Aspire configuraiton  here...

await builder.Build().RunAsync();
 

void EnsureDeveloperControlPaneIsNotRunning()
{
    const string processName = "dcpctrl"; // The Aspire Developer Control Pane process name

    var process = Process.GetProcesses()
        .SingleOrDefault(p => p.ProcessName.Contains(processName, StringComparison.OrdinalIgnoreCase));

    if (process == null) return;

    Console.WriteLine($"Shutting down developer control pane from previous run. Process: {process.ProcessName} (ID: {process.Id})");

    Thread.Sleep(TimeSpan.FromSeconds(5)); // Allow Docker containers to shut down to avoid orphaned containers

    try
    {
        process.Kill();
        Console.WriteLine($"Process {process.Id} killed successfully.");
    }
    catch (Exception ex)
    {
        Console.WriteLine($"Failed to kill process {process.Id}: {ex.Message}");
    }
}