diff --git a/aiosmtpd/controller.py b/aiosmtpd/controller.py
index fbb16be8..ef6ed296 100644
--- a/aiosmtpd/controller.py
+++ b/aiosmtpd/controller.py
@@ -108,6 +108,9 @@ def _cb_client_connected(
     ) -> None:
         pass
 
+    def connection_made(self, transport):
+        transport.close()
+
 
 @public
 class BaseController(metaclass=ABCMeta):
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):