Step-by-Step Guide: Installing and Configuring a Firewall on Ubuntu

Requirements

1.A server - VPSDime

2.YouTube Playlist - Firewall Installation Tutorial

3.WinSCP - File transfer client for Windows

4.PuTTY - SSH and Telnet Client

Required Ports

- HTTP: 80

- HTTPS: 443

- SSH: 22

- SMTP: 25, 465, 587

Steps to Install and Configure UFW (Uncomplicated Firewall)

1.Update the OS:

2.Install the UFW package:

3.Check the status of UFW:

4.Add Firewall Rules:

- Allow SSH (port 22 by default):

- Allow HTTP (port 80 by default):

- Allow HTTPS (port 443 by default):

- Allow SMTP (port 25 by default):

- Allow SMTP SSL protocol (port 465):

- Allow SMTP TLS protocol (port 587):

5.Deleting a Rule:

- Check the current rules with indices:

- Delete a rule by its index number (example: to delete rule 5):

Additional Resources