Node.js is not accessible from external IPs on Ubuntu - node.js

Question

I try to access my node.js server running on Ubuntu. My PC is connected with TP-link router. Now, I want to access node services from other IP(not from my local host or local IPs). What can I do? I used following code.
Note: This server works fine and accessible from local IP but can't access from my public IP
http.listen(6000,"0.0.0.0",function(){
log.info("server started");
})

Answer 1

You have to use :-
iptables -A OUTPUT -p tcp --sport 8080 -j ACCEPT
for the outgoing rule (not dport). Apart from that, maybe there's an earlier rule that blocks the traffic? Try iptables -L.

Answer 2

Ubuntu have very good firewall and default system is not allow to external IP to response
In express and node js or any server like that
http.listen(6000,"0.0.0.0",function(){
log.info("server started");
})
It will work on your IP, localhost and public IP
but on external IP can't access it
first of all replace
localhost -> 0.0.0.0
when you want to run frontend and backend simultaneously
then it is better to use public IP directly instead of 0.0.0.0
If you are using ubuntu then we need to change in firewall settings using ufw
UFW is installed by default on Ubuntu. If it has been uninstalled for some reason, you can install it with apt-get:
sudo apt-get install ufw
then
sudo nano /etc/default/ufw
check this line and make it yes
IPV6=yes
save file using Ctrl-X to exit the file, then shift + y to save the changes that you made, then ENTER
At any time, you can check the status of UFW with this command:
sudo ufw status verbose
By default, UFW is disabled so you should see something like this:
Output:
Status: inactive
Not most important point
sudo ufw allow portNumber // here portNumber is port-number in integer
in your case
sudo ufw allow 6000
and allow
sudo ufw allow http
for more rules and firewall on ubuntu click here