This is crucial for servers, but it also makes a regular user’s system much safer, giving you control. Why should you use a Firewall?Ī firewall is a way to regulate the incoming and outgoing traffic on your network. It is actually an interface for iptables, which is the classic low-level tool (and harder to get comfortable with) to set up rules for your network. Want to learn more about how to minimize risk with spam, email spoofing and other types of email-based phishing attacks? Check out our guide on how to block spam in cPanel and WHM.UFW (Uncomplicated Firewall) is a simple-to-use firewall utility with plenty of options for all kinds of users.
To find the rule number for UFW rules: sudo ufw status numbered.To check whether UFW is running with additional information such as logging and profile status:.To close a port in UFW using the port number:Īfter making changes to any firewall, you should verify your changes to ensure they’re correct and active.To close a port in UFW using the service name:.You can accomplish this using the service name or port number. After you open a port in UFW, ensure UFW is enabled:Īfter you uninstall software you should close any ports you no longer need open on your system.Sudo ufw allow from 1.2.3.4 to any port 22 To allow connections on a specific port from an IP address:.To allow all connections from a specific IP subnet:.If you need to allow all connections from a specific system or network IP address: sudo ufw allow from 1.2.3.4.If there is no service listed for the port, you can open the port by specifying the port and protocol (TCP/UDP):.If the service is listed, you can open the port using the service name (TCP/UDP protocol optional):.OpenVPN, PostgreSQL, IRC):Ĭat /etc/services | grep portTo navigate the full list, use Page Up, Page Down, and arrow keys after using the less command: less /etc/services
Check if the application port is defined as a service (e.g.Below we cover how to open ports using the port number, service name, and custom IP/port combination. There are multiple ways to open a port in UFW.
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