Well there's your problem. The DECA on the HR21-100 has to connect to the ethernet port of the 21.
Yes... All lights are lit.. However its not connected to the HR21-100 as The DECA goes directly to the Router. VOS the setup as is worked for some time only change I made was to Change out the H25 with the HR21-100 its perplexing. also ran the imanedgecutter,Bringmrvback,mrvclienton,widgetson
out of Ideas
If you're trying to do "double duty" it needs a switch:
Your other receivers are connected like this:
So when you swapped the H25 out, "I figured" you knew how to connect the right DECA to the HR21, but it sounds like you have a CCK next to the H25, and not the right DECA for the HR21.