I have a 10.7 server that works great for multi casting with deploy studio. I bought a new mac mini running 10.11 and set up deploy studio and multicast barely works at all. It fails almost every time. When it fails it wont work again for a long while. Seems like the multi cast is still going or something. Even after I restart the server. I have looked at wireshark during this time and the packets are not being broadcasted or anything. Unicast works fine every time. All network switches and routing are configured for multicast as the 10.7 server works great on the same network. Any ideas what might be happening?