Running the latest version on raspberry pi zero W, DNS over https with Cloudflare. Use Scott Helme's setup. Using dnsmasq not FTL. IPv4 network, IPv6 blocked in the router and ISP doesn't support it. IPv6 test says:
IPv6 connectivity: IPv6 Not supported
Browser
Default IPv4
Fallback No
DNS
DNS4 + IP6 Unreachable
DNS6 + IP4 Reachable
DNS6 + IP6 Unreachable
Noticed some adds are still going through, checked the queries, noticed known add server blocked over IPv4 but forwarded over IPv6. Manually blacklisted the server on IPv6, refreshed the webpage, add is gone. Found a thread about it but it was about FTL not dnsmasq so it doesn't seem to apply to my setup.
Pi-hole version is v3.3.1 (Latest: v3.3.1)
AdminLTE version is v3.3 (Latest: v3.3)
FTL version is v3.0 (Latest: v3.0)
dnsmasq.service - dnsmasq - A lightweight DHCP and caching DNS server
Loaded: loaded (/lib/systemd/system/dnsmasq.service; enabled; vendor preset: enabled)
Active: active (running) since Mon 2018-04-23 19:39:17 UTC; 2min 56s ago
sudo systemctl status pinhole-FTL
Unit pinhole-FTL.service could not be found.
And then check the link I provided for the explanation of why you will see IPv6 forwarded when you do not have IPv6 capability on the network segment. It's a false positive, since there's no way for an IPv6 address to be reached from inside your network.
It will show exited status when it forks the process. Can you do a pihole -d to check the configuration and upload the logs for us to look over? You'll get a token that lets us know which log to take a look at.