This description above is the opposite of what was described by the original poster who said:
@Tenglang If you assume all errors have the same cause, then you will get lost pretty quickly. You should post a detail description of the error(s) in failure to access through the webapp in a new thread.
In general, failure to authenticate will prevent a My Cloud Home user from accessing their documents online. This could involve the WD authentication servers, the browser version, browser tracking cookies, the router UPnP and firewall or failure to install security updates on mobile or desktop OSes.
