OK...I'll apologize for starting another thread on this - but it's been very hard to find anything that has helped, with most threads being about XP. Anyway - running Vista Business version, WMP 11, connected to home network wirelessly through router provided by Verizon with FIOS install. HR20 is connected via ethernet. Issue - when going into media sharing, I don't see "Unknown Device", only "Other users of this PC" HR20 is connected OK. I can get to On Demand services, ping it from my PC, and see it in the router. I think that I can ping it from my PC means that nothing on the router is blocking this traffic. I've also temporarily tried turning off router firewall & Windows firewall. Both are currently on. IPSec Policy has been turned off. SSDP Discovery is on. Network settings show private network, allow media sharing. Media Player network service starts fine. I've rebooted my PC, and the HR20. I don't see any errors in Event Viewer, or on the router log. Ideas?