Pi-hole displays Active Clients, but does not receive large numbers of queries or block content

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Are you sure your devices are configured to use Pi-hole?

Your router is advertising external DNS server to your devices:

dns-server: 75.75.75.75
dns-server: 75.75.76.76

You need to configure each individual device to use Pi-hole as DNS server, or change the DNS servers in your router DHCP/LAN settings.

Try this:

How do I configure my devices to use Pi-hole as their DNS server?

Three methods Generally, there are three different methods that will enable devices on your network to be protected by Pi-hole. 1. Define Pi-hole's IP address as the only DNS entry in the router Rationale Only is italicized here for a reason: Pi-hole needs to be the only DNS server because it intercepts queries and decides whether or not they should be blocked. If you have other DNS servers configured, you may be sent to the correct domain, bypassing Pi-hole completely. Because of this, we re…