Rigproxy's free DNS service (BCT post here) is the solution for mining rig because of windows that can do whatever it wants to do even when update services and parameters are disabled.

Advice : as we currently only have one server running (others have been temporary disabled), please use :
- rigproxy server (92.222.144.203) as main DNS on your rig
- your local router's or google's 8.8.8.8 as second server