Step-by-Step Guide: Accessing and Managing Firewall on a Linux VPS using ufw

To access the firewall on your Linux VPS, you can use "iptables" or the more user-friendly frontend "ufw" (Uncomplicated Firewall). Here's a step-by-step guide to managing the firewall with ufw:

1. Connect to Your Linux VPS:

• Use SSH or any other remote access method to connect to your Linux VPS.

2. Log In to Your VPS:

• Open a terminal or SSH client and log in to your VPS using your credentials.

3. Check for ufw Installation:

• To check if ufw is installed, run the command:

• If ufw is not installed, you can install it with:

4. Enable ufw:

• Once ufw is installed, enable it with:

• Note: Enabling ufw may briefly drop your SSH connection. Ensure you have alternative access to your VPS in case of disconnection.

5. Allow Incoming Connections to Specific Ports:

• To permit incoming connections to a specific port, use:

• Replace <port_number> with the desired port (e.g., 80 for HTTP).
• To specify a protocol (e.g., TCP or UDP), add it after the port number:

6. Deny Incoming Connections on Specific Ports:

• To deny incoming connections on a specific port, use:

7. Check ufw Status and Firewall Rules:

• View the current firewall rules and ufw status with:

8. Modify or Delete Existing Rules:

• You can modify or delete existing rules using ufw commands. Consult the ufw documentation or run man ufw for advanced configuration options.

Remember to be cautious when configuring the firewall to avoid unintended blocking of necessary connections or exposing your VPS to security risks. Review and test your firewall rules thoroughly for best practices.