I tried Ethereal and I don't see any activity. I see both other Rios playing very nicely on the network. Just to possibly complicate things I am using a router to manage DHCP and it was set to "forever" on assigned IP address leases. I've reset that to expire the leases after half an hour to see if that would cause a new IP to be assigned but no change on the player. I notice the light for activity on the Rio is faint and only flickering a little when searching for the music server - symptomatic of anything? Is the Ethernet card 'fried' maybe?