I'm assuming your loopback interface is actually in the trust zone?
Have you tried setting the DNS proxy to use the upstream DNS servers your ISP provides, as they may provide better service than the google ones.
220.127.116.11/13 appears to be located in Australia, so you may benefit from using DNS closer to your office to prevent running into peering issues
The log you attached shows the source to be an internal IP in the trust zone going out to untrust 18.104.22.168
So if your dns proxy is on a loopback in the untrust zone, the log you attached does not match your dns proxy
Did you configure your clients to use the IP of your DNS proxy interface as their DNS server ? For the proxy to work, the clients need to use "the firewall" as their preferred dns server (or the internal DNS needs to use the firewall as it's upstream server)
Click Accept as Solution to acknowledge that the answer to your question has been provided.
The button appears next to the replies on topics you’ve started. The member who gave the solution and all future visitors to this topic will appreciate it!
These simple actions take just seconds of your time, but go a long way in showing appreciation for community members and the LIVEcommunity as a whole!
The LIVEcommunity thanks you for your participation!