Network Connection Failure (905)

I was having the exactky the same error in Android when trying to access My Cloud from an external network and I was able to fix it changing a router configuration: enabling Port Forwarding. This link has the complete steps in order to achieve this:

http://wdc.custhelp.com/app/answers/detail/search/1/a_id/8526/c/130/p/247,487

Hope this helps.