Open ports on UFW (uncomplicated Firewall - Ubuntu)

Open ports on UFW (uncomplicated Firewall - Ubuntu).

I wanted to unblock 5432 port for a PostGre SQL setup.

Here is how you do it.

To check status for firewall

ahmed@ahmed-work-horse:~$ sudo service ufw status

ufw start/running

you can also use this command to check status

ahmed@ahmed-work-horse:~$ sudo ufw status

Status: inactive

ahmed@ahmed-work-horse:~$ sudo ufw status

Status: inactive

ahmed@ahmed-work-horse:~$ sudo ufw enable 

Firewall is active and enabled on system startup

If the status is not stopped/waiting, you can enable it using the below command

ahmed@ahmed-work-horse:~$ sudo ufw enable

To open a port say 5432:

ahmed@ahmed-work-horse:~$ sudo ufw allow 5432

To block/close an opened port:

ahmed@ahmed-work-horse:~$ sudo ufw deny 5432

To remove a rule, use delete followed by the rule:

ahmed@ahmed-work-horse:~$ sudo ufw delete deny 5432

It is also possible to allow access from specific hosts or networks to a port. The following example allows ssh access from host 192.168.0.2 to any ip address on this host:

ahmed@ahmed-work-horse:~$ sudo ufw allow proto tcp from 172.16.167.2 to any port 5432

Rules updated

ahmed@ahmed-work-horse:~$ sudo ufw status

Status: active




To                         Action      From

--                         ------      ----

5432/tcp                   ALLOW       172.16.167.2




ahmed@ahmed-work-horse:~$

Replace 172.16.167.2 with 172.16.0.0/24 to allow port 5432 access from the entire subnet.

ufw can be disabled by:

ahmed@ahmed-work-horse:~$ sudo ufw disable

Thats it!!!.