Add testjamesnk/http3-dynamicport

2 files changed, 38 insertions, 1 deletions

diff --git a/src/Servers/Kestrel/Core/src/Internal/KestrelServerImpl.cs b/src/Servers/Kestrel/Core/src/Internal/KestrelServerImpl.cs
index d6ef8b5ffb..a95d853828 100644
--- a/src/Servers/Kestrel/Core/src/Internal/KestrelServerImpl.cs
+++ b/src/Servers/Kestrel/Core/src/Internal/KestrelServerImpl.cs
@@ -218,7 +218,8 @@ internal sealed class KestrelServerImpl : IServer
 
                 if (hasHttp3 && _multiplexedTransportFactory is not null)
                 {
-                    // The
+                    // Check if a previous transport has changed the endpoint. If it has then the endpoint is dynamic and we can't guarantee it will work for other transports.
+                    // For more details, see https://github.com/dotnet/aspnetcore/issues/42982
                     if (!configuredEndpoint.Equals(options.EndPoint))
                     {
                         Trace.LogError(CoreStrings.DynamicPortOnMultipleTransportsNotSupported);
diff --git a/src/Servers/Kestrel/Transport.Quic/test/WebHostTests.cs b/src/Servers/Kestrel/Transport.Quic/test/WebHostTests.cs
index 259cc7532d..159e516eca 100644
--- a/src/Servers/Kestrel/Transport.Quic/test/WebHostTests.cs
+++ b/src/Servers/Kestrel/Transport.Quic/test/WebHostTests.cs
@@ -8,6 +8,7 @@ using Microsoft.AspNetCore.Connections;
 using Microsoft.AspNetCore.Hosting;
 using Microsoft.AspNetCore.Http;
 using Microsoft.AspNetCore.Internal;
+using Microsoft.AspNetCore.Server.Kestrel.Core;
 using Microsoft.AspNetCore.Testing;
 using Microsoft.Extensions.Hosting;
 using Microsoft.Extensions.Logging;
@@ -132,6 +133,41 @@ public class WebHostTests : LoggedTest
 
     [ConditionalFact]
     [MsQuicSupported]
+    public async Task Listen_Http3AndSocketsOnDynamicEndpoint_Http3Disabled()
+    {
+        // Arrange
+        var builder = new HostBuilder()
+            .ConfigureWebHost(webHostBuilder =>
+            {
+                webHostBuilder
+                    .UseKestrel(o =>
+                    {
+                        o.Listen(IPAddress.Parse("127.0.0.1"), 0, listenOptions =>
+                        {
+                            listenOptions.Protocols = Core.HttpProtocols.Http1AndHttp2AndHttp3;
+                            listenOptions.UseHttps(TestResources.GetTestCertificate());
+                        });
+                    })
+                    .Configure(app =>
+                    {
+                        app.Run(async context =>
+                        {
+                            await context.Response.WriteAsync("hello, world");
+                        });
+                    });
+            })
+            .ConfigureServices(AddTestLogging);
+
+        using var host = builder.Build();
+        await host.StartAsync().DefaultTimeout();
+
+        Assert.Contains(TestSink.Writes, w => w.Message == CoreStrings.DynamicPortOnMultipleTransportsNotSupported);
+
+        await host.StopAsync().DefaultTimeout();
+    }
+
+    [ConditionalFact]
+    [MsQuicSupported]
     public async Task Listen_Http3AndSocketsCoexistOnSameEndpoint_ClientSuccess()
     {
         await BindPortsWithRetry(async port =>