Cisco Small Business Router Error

[Smudger]

Hi, I'm trying to configure the above , but keep getting the following message when testing the connection:

no configured DNS server(s) are routable through the selected interface

This occurs at the 'Exit Interface' test. Thing is, I can't find any mention of the exit interface, nor find anywhere that matches the suggested solution.

EDIT: The suggested solution is:

'Select 'Enter IP address or hostname' option or add a 'host specific/network specific/default' route through this interface and retest connection'

Anyone out there set one of these up before?

Help!

[Moby-Dick]

so it wants you to route traffic from the LAN interface to the dsl one.
you also might want to let the router know what your ISP dns servers are ?

[Smudger]

I've already let it know what the ISP DNS servers are, but that didn't help...