How To Unblock an IP Address in CSF

Posted on April 18, 2014 by J. Mays

Category: Technical Support | Tags: CSF, Firewall, Security

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CSF is generally considered an advanced firewall given it has many more configuration options than most other software firewalls (such as APF). It’s also still simple enough to install and configure, even for novice system administrators. For a simple overview on how to install and configure CSF and its security plugin LFD (Login Failure Daemon), visit our tutorial.

Check CSF for Your IP Address

Let’s say that you want to check whether or not a specific IP address, maybe 8.8.8.8 , is blocked by CSF. That’s easy!

csf -g 8.8.8.8

Unblock an IP Address

If the IP address is denied in CSF and you want to remove it, then use this command:

csf -dr 8.8.8.8

CSF then needs to be restarted for the change to take effect:

csf -r

About the Author: J. Mays

As a previous contributor, JMays shares his insight with our Knowledge Base center. In our Knowledge Base, you'll be able to find how-to articles on Ubuntu, CentOS, Fedora and much more!