Whole-home DVR only works on 2 of 3 receivers

My WHDVR used to work fine. Then my primary receiver died and DirectTV sent me a new receiver. I reconnected the blue ethernet cable that enables WHDVR, but the two receivers don't see each other.

HOWEVER, when I bring a third receiver from my other address, receivers #2 and #3 see each other, but receiver #1 (the one with the blue ethernet cable) does not see the other two, and the other two don't see it.  In summary, the receiver that has the blue ethernet cable (what I consider to be the primary receiver in this setup), does not "participate" in the sharing of receivers.

Any ideas?  Thanks.