Can you connect MyCloud directly to your ISP's modem?

I couldn’t find a way to post in Port forwarding - #42 by Etupes, so I thought I’d try here.

I am a WOW! subscriber and just had my old modem replaced with an ARRIS TG2472G modem/router. My MyCloud is plugged into one of the 4 Ethernet pots in the back of the ARRIS and I am unable to connect to it.

I’ve used Windows 10 Add a Network Device feature, but the ARRIS does not show up in the list. I’ve also tried WDMyClould.com/setup, but that also failed to find the ARRIS. Any ideas how I get my MyCloud connected again?

For now, every time I want a file, I connect it directly into my laptop, but then my laptop loses its Wi-Fi connection.

I have set up port forwarding from WD Int 80/Ext9080 to Arris Inbound 9080/Local 80 and WD Int 443/Ext9443 to Arris Inbound 9443/Local 443. But, when I run MyCloud setup, I still get “Device Unavailable”. Yes, it’s plugged in, the light is blue, and the Ethernet cable is good.

Port80
Port443

This shouldn’t be this hard. Does anyone have any ideas what I can try next?