Pi-Hole won't resolve DNS requests

[jfb]

I don't run a Fritz Box, but there have been issues with DNS rebinding. The thread referenced below provides additional information - note there is a section on Fritz Box.

Why won't Pi-hole work with DNS rebind protection enabled?

What is DNS rebind protection? If your router has an option called DNS rebind protection enabled, you may run into issues when trying to use Pi-hole as your DNS server. The reasons for this are quite technical, but to summarize what this option does in one sentence: DNS rebind protection does not allow DNS queries to be answered with a local IP address. Why does this interfere with Pi-hole? DNS rebind is meant to be a countermeasure to an attack on your network. So in many cases, it's actu…