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How to unblock an IP address using CSF on DirectAdmin

by Thạch Phạm
Published: Last Updated on

How to unblock an IP address using CSF on DirectAdmin

CSF or ConfigServer Security & Firewall is a popular Stateful Packet Inspection (SPI) firewall distributed as open source. CSF is very widely used and popular, most server services, control panels are equipped with this application to prevent security risks as well as restrict attacks.

CSF features intrusion detection and application security for Linux host systems set up in csf.conf. For example, CSF will immediately block that IP to protect the server if someone tries to log in to your server or SSH into the wrong server many times.

However, in some cases where you forget your login information, log in incorrectly many times and CSF itself blocks your IP, making you unable to log in, in this article, AZDIGI will guide you to unblock IP in CSF on DirectAdmin using the interface and in SSH.

Note: If your IP is blocked, you cannot access DirectAdmin or SSH. Please use another network (different wifi, 3-4G) to access and remove the old IP that is being blocked.

1. Unlock IP on the DirectAdmin dashboard

This will help you find and unlock the IP directly on the DirectAdmin interface.

Step 1: Login to DirectAdmin

Please log in to DirectAdmin with an admin account.

unlock an IP using CSF on DirectAdmin

Step 2: Find and select ConfigServer Security & Firewall (CSF)

Once logged in within DirectAdmin, find the ConfigServer Security & Firewall function. (you can find it in the Extra Features menu or use the search box)

  • For the new DirectAdmin interface
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Standard interface

CleanShot 2022 05 14 at 10.44.38
Refreshed interface
  • For the old DirectAdmin interface
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Step 3: Find the IP and remove the blocked IP

After entering ConfigServer Security & Firewall, go to the Search for IP section, enter the IP you want to open and press the Enter button on the keyboard.

If you do not know which IP is being locked, at the locked device, you access the IP check link below, you will see an IP address appear on the screen.

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Then you will see a message line including the IP address, cause and time of blocking. To remove this IP from the block list, click the green button with the line Remove IP block.

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2. Unlock IP in SSH

In addition to using the interface above, another way is to SSH into the server to remove it. Usually, I use this method because it’s faster and more professional.

Step 1: SSH into the server

If you do not know how to SSH into the server, please refer to the following article:

Step 2: Check IP

To check if any IP is locked on CSF, you can check with the command csf -g xx.xx.xx.xx and xx.xxx.xx.xx is the IP to check.

  • For example:
AZDIGI Tutorial
[root@sv ~]# csf -g

Table  Chain            num   pkts bytes target     prot opt in     out     source               destination

filter DENYIN           157      3   120 DROP       all  --  !lo    *

filter DENYOUT          157      0     0 LOGDROPOUT  all  --  *      !lo  


Table  Chain            num   pkts bytes target     prot opt in     out     source               destination
No matches found for in ip6tables

csf.deny: # lfd: (sshd) Failed SSH login from (IT/Italy/-): 5 in the last 3600 secs - Wed Apr 27 06:35:15 2022

Step 3: Remove blocked IP from CSF

To remove blocked IP from CSF you use the command syntax csf -dr xx.xx.xx.xx (xx.xx.xx.xx is the IP to remove)

AZDIGI Tutorial
[root@sv ~]# csf -dr
Removing rule...
DROP  all opt -- in !lo out *  ->
LOGDROPOUT  all opt -- in * out !lo  ->

So AZDIGI has completed instructions on unlocking IP using CSF on DirectAdmin with 2 methods for you. Wishing you success!

  • See more articles about CSF here.

If you need support, you can contact support in the ways below:

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