Asus RT-N66U Router - Radio problem

I have upgraded from the standard BT Homehub to the Asus RT-N66U Router, however, since making this change I can no longer get the internet radio to operate. If I switch back to the BT Homehub the radio feature works no problem.

I have played around with various settings on the Asus Router, but I am far from knowledgeable with these things, and so far I have had no sucess.

I was hoping that someone may be able to offer some advice or suggestions.

I have an Akurate DS.

Any thoughts or suggestions would be much appreciated.