Infrastructure, Systems, and Connectivity
This article explains how to identify the registrar of a domain, how to list domains with DNSSEC enabled on a server, and how to modify the hosts file on macOS, Linux, and Windows systems. These procedures help administrators manage domain ownership, DNS security, and local DNS overrides for testing and development.
This article explains how nameservers work in a cPanel & WHM environment and provides a complete step-by-step guide to configuring nameserver software, setting default nameservers, assigning IP addresses, creating A/AAAA records, and adding A records for the server hostname. It is designed for administrators who want to properly configure DNS for their hosting infrastructure.
This article explains what a Reverse Trust relationship is in a cPanel & WHM DNS cluster, why it is required, and how servers use API tokens to authenticate and exchange DNS records securely. It also outlines the importance of mutual trust between all servers in the cluster.
This guide explains how DNS clusters work in cPanel & WHM, including requirements, recommended structures, trusted IP configuration, direct and intermediary linking, performance considerations, and the importance of Reverse Trust relationships. It also covers how to manage API tokens and how DNSOnly servers fit into a cluster.
This guide explains how the rpm.versions system in cPanel & WHM manages RPM and DEB packages, how to safely override default package states, how the directory hierarchy works, and how to use update_local_rpm_versions to avoid YAML formatting issues. It includes practical examples and best‑practice warnings.
This guide covers essential troubleshooting and quick-repair tools available in cPanel & WHM, including Autofixer, cloud-hosted hostname fixes, restoring database grants, using the scl utility for PHP management, and diagnosing Perl/CGI script issues.
This article explains how ModSecurity 3 works in cPanel & WHM, how to install and configure it for Apache or NGINX, key differences from ModSecurity 2, and how to use the experimental NGINX Standalone web server. It includes configuration paths, warnings, and compatibility notes for production environments.
This article covers three important areas of new cPanel & WHM features: 1) ModSecurity 3 and its differences from version 2 2) NGINX Standalone web server and its limitations 3) How to add and manage Sitejet custom templates to serve cPanel users This guide is written for server administrators, hosting providers, and cPanel partne
This article explains how to configure your SFTP client to securely connect to your cPanel account, what connection details are required, how SFTP differs from FTP, and how to manage or deny FTP access. It also covers how to edit FTP server configurations from the command line for both ProFTP and Pure-FTP environments.
This article explains how to manually edit FTP server configuration from the command line, determine which FTP service is running, and apply configuration changes for both ProFTP and Pure-FTP. It also covers managed_settings options and how to apply updates using force rebuild commands.
This article explains how to enable FTP Passive Mode, the differences between active and passive sessions, how to configure Pure-FTPd and ProFTPD servers, how to adjust NAT-related settings, and how to open passive port ranges in firewalls such as CSF, nftables, firewalld, and iptables. It also covers troubleshooting steps and how to restore missing FTP interfaces in cPanel.
This article explains how to upload and download files using FTP through both third‑party clients and the command‑line interface. It also covers how to connect to an FTP server, required credentials, file transfer commands, and advanced ProFTPD host access control configuration for restricting FTP access by IP address.
