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DNS Proxy: Deny users DNS changes

You can prevent users from changing DNS using Active Directory Group Policies.
Refers to Microsoft online guides for more information about GPO (Group Policy Objects).

Another improvement consist of creating some rules on your Router/Firewall, to automatically redirect DNS requests from PCs to the Proxy DNS Private IP.

In this way the internal devices configured to use a DNS different from the DNS Proxy IP, will be filtered using the Default Filter Policies.
IMPORTANT: This rule has to be applied to all IPs except the DNS Proxy.