DNS wont resolve :(

[deHakkelaar]

That looks all good now.
Firewall could still drop though:

Admin page shows FTL Offline | Unable to start, cannot access dhcp.leases

Below ones seems to do the trick: sudo iptables -F sudo iptables -X sudo iptables -t nat -F sudo iptables -t nat -X sudo iptables -t nat -L -n -v sudo iptables -t mangle -F sudo iptables -t mangle -X sudo iptables -P INPUT ACCEPT sudo iptables -P OUTPUT ACCEPT sudo iptables -P FORWARD ACCEPT Check afterwards with: pi@noads:~ $ sudo iptables -L -n Chain INPUT (policy ACCEPT) target prot opt source destination Chain FORWARD (policy ACCEPT) target prot opt source …

And some routers got some kind of rebind protection.
Check your router settings for similar!

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 ac…

EDIT: ow and some AV software mangle DNS lookups:

Literally no ads being blocked

That Windows machine you are using wouldn't run a virus scanner like AVAST? AVAST offers a feature called RealSite that will inject additional DNS queries to a "trusted" DNS server (run by AVAST) in case something goes wrong with normal DNS resolution, see Hilfe: Windows löst Hostname auch ohne PiHole auf? - #26 by Chris80 (though German, it also contains a short solution description in English).