How to Configure UFW on Ubuntu

Last Updated: February 20, 2021

The Ubuntu Firewall (UFW) is the default firewall software on Ubuntu. It is used to control incoming and outgoing network traffic based on the rules supplied.

Steps

1
Press the Ctrl + Alt + T keys together. This will open the Terminal in Ubuntu.
- Alternatively, you can open the terminal via pressing Super key (the ⊞ Win key on Windows keyboards), and typing in "Terminal".
2
Type in the command "sudo ufw status", in order to see if the Ubuntu Firewall is enabled or not.

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3
If the return message says "Status: Inactive," then use the command "sudo ufw enable".
- If the return message says "Status: Active," then you can move on to the next step.
4
Use the command "sudo ufw status verbose" in order to list all of the firewall rules.
5
Use the following commands to edit the firewall rules:
- "sudo ufw allow " to enable incoming traffic on the specified port. For example, "sudo ufw allow 22/tcp," or "sudo ufw allow 25565/tpc" allows incoming traffic through port 22 and 25565, respectively.
- sudo ufw deny " to disable incoming traffic on the specified port. This works as the opposite of the "sudo ufw allow " command.
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Warnings

Always be careful when using the sudo command, make sure you understand what the command is going to do before you hit enter.

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When changing firewall settings, it's possible to disable protection on your device. Make sure that the firewall is always enabled, unless you have a special situation.

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