Thanks Brian. Your program gave me a clue to what I believe is the cause of the problem. I have VM Workstation installed, and that installs a couple of virtual network adapters. When you “Testmulticast” tool came up, it auto selected the IP of 1 of these adapters, and of course nothing came back. If I change the IP address to the IP address of my LAN adapter, it all started working. So this gave me a clue, that maybe WD is selecting 1 of these Virtual adapters rather than the LAN adapter. To test the theory, I disabled these virtual adapters, and bang WD started working (once I added a rule to the McAfee Firewall to let the traffic back in).
This is ok, as a test workaround, but I need to try to get this working together if I can. So is there a way or tell WD which adapter to use, or can that option be added?
Thanks heaps.
Matthew