Tag: Apf

Unblocking an IP Address or Opening a Port in the Firewall

Posted on by dpepper | Updated:
Reading Time: < 1 minute

Should you discover (or suspect) that a client or customer’s IP address has been blocked by the firewall on your cPanel VPS server, or should you just need to open or close a port, you may be able to quickly resolve the issue yourself with just a little help.

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Advanced Policy Firewall, or APF, is a software firewall commonly installed on Liquid Web servers. It is an interface to iptables, which is standard software for managing network ports on Linux. Interacting with iptables can be complex, but APF greatly simplifies the process. APF is only accessible via ssh, and there is no way to make changes in APF through WHM or cPanel.

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Opening Ports In Your Firewall

Posted on by Patrick Hawkins | Updated:
Reading Time: 2 minutes

Occasionally, you will find that you need to open up a port in your firewall for some application or another. Depending on which firewall is installed on your server, there are several ways to go about this:

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Are you unable to connect to your server to send and receive email, log into cPanel or WHM, or make an FTP or SSH connection?

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What is APF?

Advanced Policy Firewall, or APF, is a firewall sometimes seen on Liquid Web’s servers. It is basically an interface to iptables, which is the standard interface to managing network ports on Linux machines. Interacting with iptables can be complex and error-prone, and APF greatly simplifies working with it. However, APF is still only accessible by ssh. There is no way to make changes in APF through WHM or cPanel.

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