If you don’t care about having Internet available to your WD boxes, then just add in 127.0.0.1 as the DNS option on each box and that should be it.
If your router supports DNS host mapping or something similar, place an entry for www.wdtvlive.com that points to a non routable IP (something like 172.16.1.1 for example). Then make sure you set each WD box DNS entry to your router’s IP address. This will allow them to access the Internet but will properly block all access to the wdtvlive website.
If your router does not support DNS mapping, and you need Internet access on the WD boxes, your only real option is to downgrade each one to the previous firmware. Here is the link to forum post on how to do that: Downgrade Firmware from 2.02.32 to 2.01.86
