--- a/src/twisted/test/test_udp.py
+++ b/src/twisted/test/test_udp.py
@@ -500,6 +500,7 @@ class ReactorShutdownInteractionTests(un
 
 
 
+@unittest.SkipTest("Multicast networking doesn't work with ")
 class MulticastTests(unittest.TestCase):
 
     def setUp(self):