Articles & Guides
Useful resources for web developers and system administrators
DNS
Domain status codes: clientHold, serverHold, pendingDelete
A practical guide to all 23 ICANN EPP status codes: holds, transfer locks, redemptionPeriod and pendingDelete, with RDAP examples and next actions.
SSL/TLS
openssl s_client: 30 tested commands for TLS debugging
30 tested openssl s_client commands with observed output: certificates, SNI, TLS versions, ALPN, STARTTLS and verification failures.
DNS
dig Command Examples: 25 Tested DNS Troubleshooting Commands
25 tested dig commands: compare resolvers, query authoritative nameservers, trace delegation, and inspect DNSSEC. Real output shows what to check next.
Security
PHP2Shell (CVE-2026-109618, CVE-2026-109619) — PHP RCE: who is affected and how to check
PHP2Shell: critical PHP RCE (CVSS 9.2), exploited in the wild, in CISA KEV. Fixed in 8.2.35, 8.3.36, 8.4.27, 8.5.12. How to check and what to do.
Networking
How to Open Command Prompt as Admin: Methods and CMD Commands
How to open Command Prompt in Windows 10 and 11, including as administrator, plus cmd vs PowerShell and the network commands for checking a website.
Infrastructure
How to Use VirtualBox: Setup, Networking and Snapshots
How to use VirtualBox: download and install it, enable VT-x, create a Linux VM, pick the right network mode, forward ports to a staging site and fix common errors.
Tools
How to Install Node.js on Windows, macOS and Linux (with nvm)
How to install Node.js on Windows 11/10, macOS and Linux: the LTS .msi from nodejs.org, winget, nvm, verifying node -v and npm -v, and fixing PATH and EACCES errors.
Security
What Is Kali Linux Used For? Uses, Install, Legality
What Kali Linux is used for, whether it is legal, where to download official images, how to run it in VirtualBox or WSL, and the default kali/kali login.
Tools
How to Install Git on Windows, Mac and Linux: Step by Step
Install Git on Windows with the official installer or winget, on Mac with xcode-select or Homebrew, on Linux via apt or dnf, then set it up and secure .git.
Infrastructure
Is Arch Linux Good for Beginners? Install Guide and Trade-offs
Is Arch Linux good for beginners? Rolling release, pacman and the AUR explained, Arch vs Ubuntu, the real downsides, and installing it with archinstall or by hand.