Update vpn-gateway-vpn-faq.md

added Azure DNS Private Resolver's forwarding rule

Author: fabferri

articles/vpn-gateway/vpn-gateway-vpn-faq.md

@@ -70,6 +70,8 @@ To help ensure proper functionality and healthy state for your VPN gateway, cons
 * Revert to the Azure DNS default by removing the custom DNS within the VNet settings (recommended configuration).
 * Add in your custom DNS configuration a DNS forwarder that points to Azure DNS (168.63.129.16). Depending on the specific rules and nature of your custom DNS, this setup might not resolve the issue as expected.
 
+When configuring the Azure DNS Private Resolver's forwarding rule in the VNet where the VPN Gateway is deployed, if you include a wildcard in the DNS forwarding ruleset, ensure that the forwarding destination IP points to the built-in Azure DNS service (168.63.129.16) to resolve public URLs.
+
 ### Can two VPN clients connected in point-to-site to the same VPN gateway communicate?
 
 No. VPN clients connected in point-to-site to the same VPN gateway can't communicate with each other.