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How to set up a firewall on Ubuntu with UFW

UFW (Uncomplicated Firewall) is an easy way to block unwanted traffic.

Steps

Allow SSH first, or you will lock yourself out:

ufw allow 22/tcp
ufw allow 80/tcp
ufw allow 443/tcp
ufw enable

Check it:

ufw status verbose

Good to know

• Only open ports for services you really run.
• If you changed the SSH port, allow that port instead of 22.
• To remove a rule: ufw delete allow 80/tcp.

Part of the new server checklist.

More in VPS and servers

• How to connect to your Linux VPS with PuTTY (Windows)
• How to connect to a Linux VPS from Mac or Linux with SSH
• Where to find your server IP address and password
• How to change your root password on Linux
• First steps on a new Linux VPS: a security checklist

Still stuck? Open a support ticket.