DNS Issue when Client VPN connected

[glm]

We do not have DNS resolution when connected Client VPN. We have a MX250, firmware MX 14.40.  Our Client VPN configuration is the default "Use Google Public DNS".  When connected in our Client VPN subnet, ipconfig shows the DNS servers are as expected, 8.8.8.8 and 8.8.4.4. DNS resolution does not work (ping, RDP, browser, etc). My client device is Win10 19041.508. It had the issue with the prior Win10, 18363. What am I missing? Thank you.  -Greg

[PhilipDAth · Accepted solution]

Have you got any firewall rules blocking the traffic?

[glm]

Thank you for assist.  It was indeed a firewall rule. 

Since all of our other non-VPN subnets are assigned the gateway as their DNS server, a rule was never created for DNS egress, thus our final DENY rule was denying port 53 traffic from our Client VPN subnet.  Adding Outbound rules that allow port TCP and UDP 53 from our Client VPN subnet has allowed DNS resolution to Google's Public DNS to work.  Much appreciated!