I recently swapped out my old netgear router for the Deco XE 5300 system.  For over 2 years I had a Synology NAS DS220J on my network to back up and share files.  I connected everything to the new Deco network like it was on the old network, and it seems to recognize every device except the Synology NAS.  Of course, I rebooted the NAS and the Deco multiple times to no avail. 

The NAS is hard wired into the main Deco that is connected to the modem.  All other PCs in the house are hardwired to satellite Decos, which are hardwired to the main Deco through a switch. 

One of the old reports from when I first set up the Deco system does indeed show the NAS connected - it has the correct MAC number and name.  But for some reason the Deco no longer recognizes or sees the NAS unit. 

All lights on the NAS appear good - power is blue, status is steady green, LAN lights and HDD lights are flashing green showing activity.  I even had the NAS plugged into the switch, adn the ethernet port was flashing green showing activity between the NAS and the switch (the switch is good,because all other devices on the switch are recognized in the Deco app). 

Any help appreciated.