I’m trying to open port 30080 on an Ubuntu 18.04 Server vm and seeing some confusing results.
I did an iptables -L -n and this line was in the output:
ACCEPT tcp -- 0.0.0.0/0 0.0.0.0/0 tcp dpt:30080
Also, ufw shows the port as open:
sudo ufw status Status: active To Action From -- ------ ---- 30080 ALLOW Anywhere 30080/tcp ALLOW Anywhere
Netstat also shows the port in “Listening” mode:
netstat -talpn | grep 30080 tcp6 0 0 :::30080 :::* LISTEN -
So I’m not sure why nmap still shows the port as filtered:
nmap -Pn localhost -p 30080 PORT STATE SERVICE 30080/tcp filtered unknown
And if I try from a remote machine, nmap shows as closed:
PORT STATE SERVICE 30080/tcp closed unknown
Not sure where to go from here.