Something else it appears that has changed in OS5. It appears, per the following WD Staff post, that one can no longer manually set the ports for remote access/cloud access if one’s broadband provider was blocking access to those ports. While the following link/information was posted to the OS5 EX Series, I assume (until I see further info) it applies to all My Cloud devices using OS5. Some will have UPnP disabled in their router’s for security reasons.
My Cloud OS 3 Remote Access used the following ports and allowed the user to manually configure port forward on the device itself.
Internal HTTP 80
Internal HTTPS 443
External HTTP 9000 - 9999
External HTTPS 9000 - 9999
My Cloud OS 5 only uses HTTPS and does not allow the user to manually configure port forward on the device itself.
OS 5 depends on UPnP to manage the forwarding of the ports.
Internal HTTPS 4430
External HTTPS 40000 - 49999