It makes no sense to buy a $2,500 server (basically a dedicated computer) and run the digital outs through a $200 DAC.
What's wrong with that?
The subject is still unanswered, but certainly DAC should have either capabilities to decode or driver software that you can install to interface with your music server. If these features do not exist then you should consider replacing the DAC for the one with such capabilities such as Cambridge or Wyred4Sound.