How to Generate a CSR (Certificate Signing Request) with OpenSSL
A Certificate Signing Request (CSR) is required when purchasing an SSL/TLS certificate from a Certificate Authority (CA). It contains ...
How to Change the Hostname on Linux (AlmaLinux, CentOS, Ubuntu)
Changing a server's hostname is a common task after provisioning or when reorganising infrastructure. This guide covers the correct ...
Bidirectional File Sync with Unison: Installation and Usage Guide
Unison is a bidirectional file synchronisation tool that can sync two directories — locally or over SSH — propagating ...
How to Set Up SSH Key-Based Authentication on Linux (CentOS/AlmaLinux)
SSH key-based authentication is more secure than passwords — it's immune to brute-force attacks, required for automated deployments, and ...
How to Configure NAT (Network Address Translation) on Linux
Network Address Translation (NAT) allows multiple devices on a private network to share a single public IP address for ...
RPMForge is Dead: Use EPEL, Remi, or ELRepo Instead (2025 Guide)
RPMForge has been discontinued. The repository and its maintainer (repoforge.org) shut down in 2019. All RPMForge packages are no ...
Fix: cPanel Installation Unable to Synchronize with httpupdate.cpanel.net
During a fresh cPanel/WHM installation, you may encounter: "The installation process was unable to synchronize cPanel & WHM. Verify ...
cPanel: Fix SMTP Error 535 Incorrect Authentication Data
The SMTP error 535: Incorrect authentication data on cPanel servers typically means a PHP script, contact form, or mail ...