networking - Port opened with ufw marked as closed with nmap - Ask Ubuntu


i'd open port 873 on pc running ubuntu 16.04. ssh pc, type

sudo ufw allow 873

status can checked sudo ufw status:

status: active                          action      --                         ------      ---- 873                        allow       anywhere                   873 (v6)                   allow       anywhere (v6)

however, don't think port open, because 

nmap localhost -p873

returns

starting nmap 7.01 ( https://nmap.org ) @ 2016-10-21 hh:mm edt nmap scan report localhost (127.0.0.1) host (0.00017s latency). port    state  service 873/tcp closed rsync  nmap done: 1 ip address (1 host up) scanned in 0.06 seconds

why so, , how open port 873?


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