You just had an install of some sort done right? That's probably why. If you don't use a deca cloud, you need to put a bsf on the HR34 so that it won't output its network signal through the coax to the other receivers, which over time is not a good thing to have happen. The HR34 is the only unit that will bridge Ethernet to the coax network, like a cck. Personally, I'd get the one deca that you will need for your one other HR21 and be done with it. Ethernet plugs into the HR34 and would bridge the network, so everything would be happy and supported. A other say, someday, other than the HR34 I expect hat all new receivers and such will not even have Ethernet ports. They will be strictly coax networked to a deca cloud. Just look at the h25.