Clould access Device not registered. (400143)

If I try to create a code a message  “Device not registered. (400143)” appears. What can I do? thanks!

http://wdc.custhelp.com/app/answers/detail/a_id/8526/session/L3RpbWUvMTQwNDI3OTc2OC9zaWQvOTU4VHNmWWw%3D

Look the network IP interface and write DNS properly

I appreciate this is an old thread, but just in case anyone else is struggling with the Device not registered. (400143) issue, this simple trick may help.

I had my WD EX2 set to use a static IP address, which ultimately proved to be the cause of the problem. My trick was to simply to configure the WD EX2 to use DHCP settings provided by the router, which proved internet connectivity and access to the storage device. I was then able to confidently reset my router back to using the relevant static IP settings and desired ports.