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How To

Install and Use CSF Firewall on RHEL / CentOS 8/7

(: April 27, 2019) How do I install and use CSF Firewall on RHEL / CentOS 8?. The first thing you do after installing your RHEL/CentOS 8 server is to configure firewall and harden server against any form of malicious access. The most popular firewall service used in RHEL based systems is Firewalld. ConfigServer Security […]

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How To

How To Unblock an IP Address in CSF

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), […]

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How To

How To Unblock an IP Address in APF

Advanced Policy Firewall, or APF, is a software firewall commonly installed on sxi.io 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 […]

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How To

Opening Ports In Your Firewall

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: APF Unfortunately, APF can only be configured by accessing the server over ssh, as the root user. Once […]

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How To

How to Back up and Restore the CSF Firewall Configuration

Advanced Firewall Configuration in WHM/cPanel How to Back up and Restore the CSF Firewall Configuration How to Block Traffic by Country in the CSF Firewall How to Allow Traffic by Country in the CSF Firewall How to Block or Allow Specific Ports by Country in the CSF Firewall Basic DoS/DDoS Mitigation with the CSF Firewall […]

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How To

Basic DoS/DDoS Mitigation with the CSF Firewall

Advanced Firewall Configuration in WHM/cPanel How to Back up and Restore the CSF Firewall Configuration How to Block Traffic by Country in the CSF Firewall How to Allow Traffic by Country in the CSF Firewall How to Block or Allow Specific Ports by Country in the CSF Firewall Basic DoS/DDoS Mitigation with the CSF Firewall […]

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How To

How to Block or Allow Specific Ports by Country in the CSF Firewall

Advanced Firewall Configuration in WHM/cPanel How to Back up and Restore the CSF Firewall Configuration How to Block Traffic by Country in the CSF Firewall How to Allow Traffic by Country in the CSF Firewall How to Block or Allow Specific Ports by Country in the CSF Firewall Basic DoS/DDoS Mitigation with the CSF Firewall […]

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How To

Unblocking an IP Address or Opening a Port in the Firewall

Most Common Support Requests Is the Server Down? I Can’t Log in or Connect A Closer Look at cPanel Notifications Updating DNS Records and DNS Propagation Time Setting up an Email Client Unable to Send Email Unblocking an IP Address or Opening a Port in the Firewall What to Expect During a Site Migration Should […]

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How To

How to Block Traffic by Country in the CSF Firewall

Advanced Firewall Configuration in WHM/cPanel How to Back up and Restore the CSF Firewall Configuration How to Block Traffic by Country in the CSF Firewall How to Allow Traffic by Country in the CSF Firewall How to Block or Allow Specific Ports by Country in the CSF Firewall Basic DoS/DDoS Mitigation with the CSF Firewall […]

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How To

How to Allow Traffic by Country in the CSF Firewall

Advanced Firewall Configuration in WHM/cPanel How to Back up and Restore the CSF Firewall Configuration How to Block Traffic by Country in the CSF Firewall How to Allow Traffic by Country in the CSF Firewall How to Block or Allow Specific Ports by Country in the CSF Firewall Basic DoS/DDoS Mitigation with the CSF Firewall […]

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How To

Troubleshooting: Server Connection Errors

When connecting to a server, many aspects  can cause your connection to not complete correctly. Here are some aspects to check before jumping to conclusions. Can You Connect to Other Sites on the Internet? Access to other sites on the Internet may indicate local workstation or local network issues. If you can access other sites […]

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How To

How To Unblock Your IP Address in Manage

sxi.io Web has introduced a new feature designed to simplify the removal of errant IP address blocks in the firewall, and allow customers to quickly remove their own address from within their Manage dashboard. In this manner, customers can remove blocks on their IP addresses even when they are unable to access WebHost Manager itself […]

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How To

How to Install ConfigServer Firewall (CSF) on Ubuntu

What is a Firewall? Broadly speaking, a firewall is part of a network or server that is designed to restrict potentially malicious and unauthorized access to the hardware while still allowing outward communication from the network or server.  There are two types of firewalls; physical hardware firewalls which are devices that connect to the destination […]