diff --git a/aiosmtpd/controller.py b/aiosmtpd/controller.py
index fbb16be8..8efa33eb 100644
--- a/aiosmtpd/controller.py
+++ b/aiosmtpd/controller.py
@@ -99,14 +99,11 @@ def __init__(self, loop: asyncio.AbstractEventLoop):
         # Imitate what SMTP does
         super().__init__(
             asyncio.StreamReader(loop=loop),
-            client_connected_cb=self._cb_client_connected,
             loop=loop,
         )
 
-    def _cb_client_connected(
-            self, reader: asyncio.StreamReader, writer: asyncio.StreamWriter
-    ) -> None:
-        pass
+    def connection_made(self, transport):
+        transport.close()
 
 
 @public
diff --git a/aiosmtpd/tests/test_server.py b/aiosmtpd/tests/test_server.py
index 443c0833..45ffe02c 100644
--- a/aiosmtpd/tests/test_server.py
+++ b/aiosmtpd/tests/test_server.py
@@ -535,7 +535,6 @@ def test_inet_contstop(self, temp_event_loop, runner):
         assert temp_event_loop.is_closed() is False
 
 
-@pytest.mark.skipif(sys.version_info >= (3, 12), reason="Hangs on 3.12")
 @pytest.mark.filterwarnings("ignore::pytest.PytestUnraisableExceptionWarning")
 class TestFactory:
     def test_normal_situation(self):