I just figured this out by myself. The culprit, turns out to be our new VZ Fios Router, G1100.
Long story short: I googled around, and found the solution here => Port 80 and 443 on Gateway Router Blocking Cloud Devices <=
As explained in that post, Verizon Fios Router will block port 80/443 by default. Hence port forwarding will never work, and WD Cloud service is depending on this port forwarding.
Solution: I did exactly like the post instructed, manually config WD Cloud service on port 9080/9443, and created port forwarding rule on my G1100 router. I also took the extra steps to add Port Forwarding under WD Admin Panel->Settings->Network->Port Forwarding, added both port 9080 and 9443, for HTTP and HTTPS respectively.
After that, it’s the Open Sesame moment…
Hope this could be helpful to those in similar situation.
Good Luck
