It looks like the MyCloud has problems negotiating link with some devices; been a few reports recently, but most around an AT&T service, and one fix is put a switch between them…
What are the indicators on the MyCloud’s Ethernet port doing? If they’re both off, it’s probably a negotiation problem.
If they’re on, it’s probably an IP address problems; are you trying to connect to the IP address of your previous device? You can connect via the broadband router, though, so the seems unlikely to be the problem.
Front panel LED will be blinking amber if it’s a network connection problem, too.
