无法在 AWS Amazon Ubuntu 上打开端口

Question

I use AWS Ubuntu Instance and try to open port 8080. This is my "Security Groups" settings:

I have added port 8080 to iptables

sudo iptables -L
Chain INPUT (policy ACCEPT)
target     prot opt source               destination         
ACCEPT     tcp  --  anywhere             anywhere             tcp dpt:http
ACCEPT     tcp  --  anywhere             anywhere             tcp dpt:http-alt

Chain FORWARD (policy ACCEPT)
target     prot opt source               destination         

Chain OUTPUT (policy ACCEPT)
target     prot opt source               destination

Firewall is disabled

sudo ufw status verbose
Status: inactive

Nmap:

nmap localhost

Starting Nmap 7.60 ( https://nmap.org ) at 2020-05-04 17:10 UTC
Nmap scan report for localhost (127.0.0.1)
Host is up (0.00012s latency).
Not shown: 999 closed ports
PORT   STATE SERVICE
22/tcp open  ssh

Only port 22 (SSH) is enabled. Do you have any ideas how I can open 8080 port?

Answer 1

Are you running any service on port 8080?

Looks to me like no service is actually running on that port.

Try running netcat -l 8080 then attempt to connect to it to validate that it is running.