hi community.
I have stubby installed, unfortunately I have since then no FTL connection more. have the system completely reinstalled and as soon as I install stubby he loses the FTL connection. Can anyone explain to me? maybe something stuck with PiVPN? About help, I'm grateful 
This sounds like a stubby configuration problem. Please upload a debug log and paste the token here and we can look at the Pi-Hole side of the setup.
the funny thing is that I can not update raspi via sudo apt-get update anymore.
thanks for the help =)
This appears to be because your DNS resolution is not working on the Pi. From your debug log it appears stubby is on port 53, which is the port pihole-FTL needs.
*** [ DIAGNOSING ]: Ports in use
127.0.1.1:53 stubby (IPv4)
[::1]:53 stubby (IPv6)
*:22 sshd (IPv4)
*:22 sshd (IPv6)
*:80 lighttpd (IPv4)
*:80 lighttpd (IPv6)
*** [ DIAGNOSING ]: Name resolution (IPv4) using a random blocked domain and a known ad-serving domain
[✗] Failed to resolve ads.pointroll.com.29591.9190.302br.net via localhost (127.0.0.1)
[✗] Failed to resolve ads.pointroll.com.29591.9190.302br.net via Pi-hole (192.168.178.7)
[✓] doubleclick.com is 172.217.168.14 via a remote, public DNS server (8.8.8.8)
thanks, I must open in the iptables port?
No, I think you need to get stubby installed so it listens on a port other than 53.
Did your Pi-Hole work properly before you installed stubby?
the PI hole worked perfectly before, only when I stubby installed comes the ftl is offline.
Unfortunately, do not continue 
Your solution would be to uninstall stubby, then install stubby correctly.
Another encrypted DNS option is DNS over HTTPS.
Thank you, I will rebuild the system and try unbound. would not know what I did wrong with stubby.
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