By default, the proxy service uses the local DNS cache or the system DNS settings. If you want to specify different DNS servers for the proxy service, use this method. This feature is available on Artica v4.40 Service Pack 106
On the left menu, go to “Your Proxy” > “DNS Settings”
Click on the settings in order to modify the settings.
Turn ON the checkbox “Proxy service Use it's own DNS servers”.
Set the DNS that will be used by the proxy service in “Primary DNS server” and “Secondary DNS server”