Don't bind to IPv6 when the OS doesn't support it

src/Servers/Kestrel/Core/src/AnyIPListenOptions.cs

@@ -3,6 +3,7 @@
 
 using System.Diagnostics;
 using System.Net;
+using System.Net.Sockets;
 using Microsoft.AspNetCore.Server.Kestrel.Core.Internal;
 using Microsoft.Extensions.Logging;
 
@@ -11,7 +12,7 @@ namespace Microsoft.AspNetCore.Server.Kestrel.Core;
 internal sealed class AnyIPListenOptions : ListenOptions
 {
     internal AnyIPListenOptions(int port)
-        : base(new IPEndPoint(IPAddress.IPv6Any, port))
+        : base(new IPEndPoint(Socket.OSSupportsIPv6 ? IPAddress.IPv6Any : IPAddress.Any, port))
     {
     }
 

src/Servers/Kestrel/Core/test/AddressBinderTests.cs

@@ -7,6 +7,7 @@
 using Microsoft.AspNetCore.Http;
 using Microsoft.AspNetCore.Server.Kestrel.Core.Internal;
 using Microsoft.AspNetCore.InternalTesting;
+using Microsoft.DotNet.RemoteExecutor;
 using Microsoft.Extensions.DependencyInjection;
 using Microsoft.Extensions.Logging;
 using Microsoft.Extensions.Logging.Abstractions;
@@ -62,6 +63,36 @@ public void ParseAddressDefaultsToAnyIPOnInvalidIPAddress(string host)
         Assert.False(https);
     }
 
+    [ConditionalFact]
+    [RemoteExecutionSupported]
+    public void ParseAddressOnOSWithoutIPv6()
+    {
+        var tmpDir = Directory.CreateTempSubdirectory();
+
+        try
+        {
+            var options = new RemoteInvokeOptions();
+            options.StartInfo.WorkingDirectory = tmpDir.FullName;
+            options.StartInfo.EnvironmentVariables["DOTNET_SYSTEM_NET_DISABLEIPV6"] = "1";
+
+            using var remoteHandle = RemoteExecutor.Invoke(static () =>
+            {
+                Assert.False(Socket.OSSupportsIPv6);
+
+                var listenOptions = AddressBinder.ParseAddress($"http://*:80", out var https);
+                Assert.IsType<AnyIPListenOptions>(listenOptions);
+                Assert.IsType<IPEndPoint>(listenOptions.EndPoint);
+                Assert.Equal(IPAddress.Any, listenOptions.IPEndPoint.Address);
+                Assert.Equal(80, listenOptions.IPEndPoint.Port);
+                Assert.False(https);
+            }, options);
+        }
+        finally
+        {
+            tmpDir.Delete(recursive: true);
+        }
+    }
+
     [Fact]
     public void ParseAddressLocalhost()
     {

src/Servers/Kestrel/Core/test/Microsoft.AspNetCore.Server.Kestrel.Core.Tests.csproj

@@ -30,5 +30,6 @@
     <Reference Include="Microsoft.Extensions.Logging" />
     <Reference Include="Microsoft.Extensions.Diagnostics.Testing" />
     <Reference Include="Microsoft.Extensions.TimeProvider.Testing" />
+    <Reference Include="Microsoft.DotNet.RemoteExecutor" />
   </ItemGroup>
 </Project>