Question

How to open different TCP ports in ubuntu 18.04

I have a PHP application which collects data from a device in 7788 port which is working fine. Now I have to open another port 8001 which is not getting data.

what is the proper way to open and enable a port in ubuntu 18.04

I have tried sudo ufw allow 22/tcp

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Hi @jahangirkobir,

Depending on what firewall you are using, you can indeed use either UFW or Iptables.

If you use ufw, you need to type in the following :

sudo ufw allow 8001/tcp

If you are using Iptables, you’ll need to open all incoming connections for that port the following way :

sudo iptables -A INPUT -p tcp --dport 8001 -m conntrack --ctstate NEW,ESTABLISHED -j ACCEPT
sudo iptables -A OUTPUT -p tcp --sport 8001 -m conntrack --ctstate ESTABLISHED -j ACCEPT

Regards, KDSys