Thanks for the respond.
I had tested the following senario, but still not working:
(1) Put the WD MBL in the DMZ segment of router (all ports will be pass thought to the WD MBL)
(2) Port forwarding at Router (80->80, 443->443, 21->21) to WD MBL
(3) Port forwarding at Router (8080->80, 8443->443, 821->21) to WD MBL
However, all the above senario, the WD MBL shown internet connection is “OK”, and I manage to access to WD MBL for FTP service and the WD MBL Web UI (port 80 & port 443) using another internet connection to my home connection. But, the remote access connection status still shown as “Connecting”.
I even tried to disable the remote access, the remote connection status should be shown as “Disable”; but the status still shown as “Connecting”; which make me guest this is a bug in the latest firmware.
I had escalated the case to WD support (with screen capture), but so far no feedback from them yet.
Since remote connection access is build in feature for WD MBL, I don’t mind try it out, at the meant time, I will using FTP. I will configure the Secure FTP, if the remote connection access take too long to resolve.