UFW -- How To Open Port 8080

Question

I thought I had allowed connections to http-alt (8080) using ufw. My reasoning for thinking this is because:

gerrit2@localhost:~$ sudo ufw status
Status: active

To                         Action      From
--                         ------      ----
22                         ALLOW       Anywhere
80/tcp                     ALLOW       Anywhere
8080/tcp                   ALLOW       Anywhere
22 (v6)                    ALLOW       Anywhere (v6)
80/tcp (v6)                ALLOW       Anywhere (v6)
8080/tcp (v6)              ALLOW       Anywhere (v6)

and

Chain INPUT (policy DROP)
target     prot opt source               destination         
ufw-before-logging-input  all  --  anywhere             anywhere            
ufw-before-input  all  --  anywhere             anywhere            
ufw-after-input  all  --  anywhere             anywhere            
ufw-after-logging-input  all  --  anywhere             anywhere            
ufw-reject-input  all  --  anywhere             anywhere            
ufw-track-input  all  --  anywhere             anywhere    

...

Chain ufw-before-input (1 references)
target     prot opt source               destination         
ACCEPT     all  --  anywhere             anywhere            
ACCEPT     all  --  anywhere             anywhere             ctstate RELATED,ESTABLISHED
ufw-logging-deny  all  --  anywhere             anywhere             ctstate INVALID
DROP       all  --  anywhere             anywhere             ctstate INVALID
ACCEPT     icmp --  anywhere             anywhere             icmp destination-unreachable
ACCEPT     icmp --  anywhere             anywhere             icmp source-quench
ACCEPT     icmp --  anywhere             anywhere             icmp time-exceeded
ACCEPT     icmp --  anywhere             anywhere             icmp parameter-problem
ACCEPT     icmp --  anywhere             anywhere             icmp echo-request
ACCEPT     udp  --  anywhere             anywhere             udp spt:bootps dpt:bootpc
ufw-not-local  all  --  anywhere             anywhere            
ACCEPT     udp  --  anywhere             224.0.0.251          udp dpt:mdns
ACCEPT     udp  --  anywhere             239.255.255.250      udp dpt:1900
ufw-user-input  all  --  anywhere             anywhere    

...

Chain ufw-user-input (1 references)
target     prot opt source               destination         
ACCEPT     tcp  --  anywhere             anywhere             tcp dpt:ssh
ACCEPT     udp  --  anywhere             anywhere             udp dpt:ssh
ACCEPT     tcp  --  anywhere             anywhere             tcp dpt:http
ACCEPT     tcp  --  anywhere             anywhere             tcp dpt:http-alt

However, when I go to see if that port is open with nmap I get the following:

[mehoggan@localhost ~]$ nmap -p 8080 matthewh.me

Starting Nmap 6.45 ( http://nmap.org ) at 2014-07-07 20:00 PDT
Nmap scan report for matthewh.me (50.116.18.212)
Host is up (0.050s latency).
rDNS record for 50.116.18.212: li418-212.members.linode.com
PORT     STATE  SERVICE
8080/tcp closed http-proxy

What do I need to do to open that port up to the outside world using Ubuntu's 14.04 ufw?

Solution

You did open your firewall correctly. In order to "open" the port, you need to actually have a service running that listens on port 8080.

Comments

[Matthew Hoggan]

I am trying to start gerrit code review to listen on that port, but it keeps failing. So I thought I had to open the port first for the service to listen on.

[Michael Hampton]

Congratulations, you've stumbled into the XY problem.