diff --git a/tests/OpenAC.MosswartMassacre.Tests/Backend/TestSocketServer.cs b/tests/OpenAC.MosswartMassacre.Tests/Backend/TestSocketServer.cs
index 6ac58d6..7ee2790 100644
--- a/tests/OpenAC.MosswartMassacre.Tests/Backend/TestSocketServer.cs
+++ b/tests/OpenAC.MosswartMassacre.Tests/Backend/TestSocketServer.cs
@@ -17,6 +17,7 @@ internal sealed class TestSocketServer : IDisposable
     private readonly CancellationTokenSource _cts = new();
     private readonly Task _accept;
     private WebSocket? _current;
+    private HttpListenerContext? _currentContext;
 
     public TestSocketServer()
     {
@@ -53,7 +54,12 @@ internal sealed class TestSocketServer : IDisposable
     {
         WebSocket socket = await WaitForSocketAsync();
         socket.Abort();
+        // Aborting the socket alone leaves the TCP connection open on some
+        // platforms' listeners, so the client never sees the drop; ending the
+        // response closes the connection everywhere, as a real server's drop does.
+        _currentContext?.Response.Abort();
         _current = null;
+        _currentContext = null;
     }
 
     public string NextFrame(int timeoutMs = 5000)
@@ -111,6 +117,7 @@ internal sealed class TestSocketServer : IDisposable
             Secrets.Enqueue(context.Request.Headers["X-Plugin-Secret"]);
             HttpListenerWebSocketContext ws = await context.AcceptWebSocketAsync(null);
             _current = ws.WebSocket;
+            _currentContext = context;
             _ = Task.Run(() => ReadLoopAsync(ws.WebSocket));
         }
     }