--- a/src/twisted/test/test_udp.py
+++ b/src/twisted/test/test_udp.py
@@ -503,6 +503,7 @@ class ReactorShutdownInteractionTests(un
 class MulticastTests(unittest.TestCase):
 
     def setUp(self):
+        raise unittest.SkipTest("Multicast networking doesn't work with OBS")
         self.server = Server()
         self.client = Client()
         # multicast won't work if we listen over loopback, apparently