6566/tcp open sane-port

Code: nmap 192.168.225.32
Starting Nmap 7.70 ( https://nmap.org ) at 2020-01-16 15:09 IST
Nmap scan report for mx (192.168.225.32)
Host is up (0.000077s latency).
Not shown: 999 closed ports
PORT STATE SERVICE
6566/tcp open sane-port

Nmap done: 1 IP address (1 host up) scanned in 0.07 secondsCode:# ufw status verbose
Status: active
Logging: on (low)
Default: deny (incoming), allow (outgoing), disabled (routed)
New profiles: skipCode:$ lsb_release -a
No LSB modules are available.
Distributor ID: Debian
Description: Debian GNU/Linux 10 (buster)
Release: 10
Codename: buster
How do I close port 6566/tcp ?