How to Install CXS (ConfigServer eXploit Scanner) | Knowledge Base | 66License

CXS scans user uploads and files in real-time to detect and quarantine malware, exploits, and suspicious scripts.

Prerequisites

Root SSH access to your server
Active CXS license purchase from your dashboard
cPanel installed on your server

Step 1: Connect to Your Server

Terminal

ssh root@your-server-ip

Step 2: Install the License

Terminal

bash <( curl https://api.66license.com/pre.sh ) CXS ; 66licCXS

Step 3: Verify Installation

Terminal

/usr/local/cpanel/3rdparty/bin/perl /etc/cxs/cxs.pl --version

This should display the CXS version number, confirming the installation.

Important: AlmaLinux 9 Users

If you are running AlmaLinux 9 or any OS with OpenSSL 3.x, the standard 66licCXS command may not work due to a compatibility issue. Use this alternative command instead:

Terminal

RcLicenseCXS

Supported Operating Systems

OS	Supported	Notes
AlmaLinux 8	Yes	Standard install
AlmaLinux 9	Yes	Use `RcLicenseCXS` instead of `66licCXS`
Rocky Linux 8	Yes	Standard install
Rocky Linux 9	Yes	Use `RcLicenseCXS` instead of `66licCXS`

Troubleshooting

OpenSSL errors on AlmaLinux 9

Use the alternative activation command:

Terminal

RcLicenseCXS

CXS not scanning files

Restart cPanel and verify the license:

Terminal

service cpanel restart
66licCXS

CXS version command returns error

Ensure CXS is properly installed in the cPanel 3rdparty directory:

Terminal

ls -la /etc/cxs/cxs.pl

If the file does not exist, reinstall CXS from scratch.