Internal Domain Resolutions using SSL VPN from non-domain devices



I am a new person to the Sophos XG environment, but I am having a perplexing issue that I can't figure out for the life of me.


When non domain devices are connecting via the SSL VPN, they are unable to resolve any server by DNS name.  When domain devices connect, it's no problem, so I have a theory that the DNS request from the VPN'd device is not pushing thru to the internal network for some reason.  I tried adding the local DNS server to the DNS list on the firewall, but to no avail.  That being said, with the third DNS server pointed internal, it is now able to resolve from the firewall, just not the non-domain device. The internal DNS servers are AD.


Any pointers or ideas on where to look to see how to get this to work properly?