How to Open a Port in CSF Firewall via WHM/cPanel?

IP addresses and Internet Protocols with the origination or destination address initiate communication sessions across ports. Ports are identified by a 16-digit number and are a component of the client-server architecture. It goes without saying that in order to open a port, the CSF firewall must be configured with the server’s security in mind.

WHM allows you to change the CSF firewall’s port settings if you are a user with a cPanel server. Please see How to Install CSF Firewall via WHM/cPanel? if you would want to install and further customize the CSF firewall.

To Open a Port in CSF Firewall

1. Log into WHM with your root account.

2. Select the Plugins option from the navigation menu.

3. Click on ConfigServer Security & Firewall.

The ConfigServer Security & Firewall panel will appear.

4. Go to the csf tab and click on the Firewall Configuration button in the csf-ConfigServer Firewall section.

Various customization options for the firewall will appear.

5. Select the IPV4 port Settings section from the dropdown list.

6. Copy/enter the following port numbers in the Allow incoming TCP ports and Allow outgoing TCP ports fields.

Allow incoming TCP ports:

20,21,22,25,53,80,110,143,443,465,587,993,995,2077,2078,2082,2083,2086,2087,2095,2096,26

Allow outgoing TCP ports:

20,21,22,25,37,43,53,80,110,113,443,587,873,2086,2087,2089,2703

Although we recommend these port numbers, you can enter other port numbers as per the requirement.

7. Click the Change button at the end.

It will save the changes you made to the firewall configuration.

8. Click on Restart csf+lfd. It will restart the csf firewall and apply the changes.

How to Open a Port in CSF Firewall via WHM/cPanel?