If I do a nmap scan from the internet i can see that the FTP port is open, but I have not enabled FTP service from internet. I used to have it open before, but I disabled it, the service is not runnin

I would like to use AdGuard Home (like PiHole), therefore I would like to configure a local address to be used as DNS server. but this is not possible as the deco app does not allow local addresses in