Blocking a Certain IP Address

How to block a certain IP address?

Blocking an IP address can help protect your server from unwanted access, abuse, or malicious activity. Depending on your setup, there are several methods to do this. Here’s a breakdown of the most common ways, including how to do it via ConfigServer Security & Firewall (CSF), which is widely used in our hosting environments:

1. Using CSF (ConfigServer Security & Firewall)

If your server uses CSF (common in cPanel and managed environments):

Block an IP:

csf -d <IP_ADDRESS>

Verify the Block:

csf -g <IP_ADDRESS>

📄 Click here for our full guide on managing IPs in CSF via terminal.

2. Using Plesk Control Panel

• Go to Tools & Settings > IP Address Banning (Fail2Ban)
• Add the IP to the deny list or set up a custom jail rule under Fail2Ban
• Alternatively, use the Firewall extension if installed

3. Using Web Server Configuration

Apache (.htaccess):

<RequireAll> 
 Require all granted 
 Require not ip 192.168.1.1 
</RequireAll>

NGINX:

deny 192.168.1.1;

4. Using Linux Firewall (iptables or firewalld)

With iptables:

iptables -A INPUT -s <IP_ADDRESS> -j DROP

With firewalld:

firewall-cmd --permanent --add-rich-rule='rule family="ipv4" source address="<IP_ADDRESS>" reject' firewall-cmd --reload

5. Need Help?

If your server is hosted with IP ServerOne (e.g., via NovaCloud or a managed server), and you’d like assistance blocking an IP, feel free to reach out:

📧 support@ipserverone.com