I tried it ..some how its not working…i will have to figure out ..something to do with iptables…

@karantaneja

Since you’re using Ubuntu, you have two main firewall options that are bundled in with the OS – one is ufw and the other is iptables (ufw is the easier of the two when it comes to usage).

You can check the status of ufw by running ufw status. If it shows as disabled, then there’s no active firewall running and you should be able to use any port that you choose.

If ufw is active, then you can open a new port using ufw allow port/protocol where port is the port that you’re wanting to open and protocol is the protocol you want to allow access over.

When it comes to protocol, you have two options, udp and tcp – tcp is the most common one that you’ll use, so if you wanted to open up port 444 (for example), you could run:

ufw allow 444/tcp

If ufw is disabled, I’d recommend setting it up. First thing I recommend is running ufw disable just to make sure it’s really disabled. Afterwards, we’ll reset the rules.

ufw reset

Now we have a clean slate. What I recommend now is setting up a deny all, except those we allow type policy.

Deny ALL Incoming Requests

ufw default deny incoming

Allow ALL Outgoing Requests

ufw default deny incoming

Allow Specific Ports

We need SSH (Port 22), HTTP (Port 80), and HTTPS/SSL (Port 443), so we’ll start with those:

ufw allow 22/tcp

ufw allow 80/tcp

ufw allow 443/tcp

Now, if you want to open port 444, we’ll add that too:

ufw allow 444/tcp

Enable ufw

ufw enable

It’ll ask you to confirm, hit y and then enter. You’re firewall is now all setup :-).