Security

In a secure or air-gapped environment, installing Windows features that normally require an internet connection can be a challenge. A common example is the OpenSSH Server, which is essential for secure remote management. When you run Add-WindowsCapability, Windows typically downloads the package from Microsoft Update. This guide provides two reliable methods for installing the OpenSSH Server on an offline Windows machine (Server 2019/2022 or Windows 10/11), ensuring you can maintain security and manageability even without internet access. ...

When diagnosing network connectivity issues, one of the most fundamental steps is to determine if a specific TCP port is open and listening on a remote host. A closed, blocked, or unresponsive port is often the root cause of application failures, and knowing how to test it is a critical skill for any IT professional. This guide provides a comprehensive overview of the most common and reliable methods to test port connectivity on Windows, from modern PowerShell cmdlets to classic command-line tools. ...

If you’ve ever downloaded a script, installer, or even a help file from the internet, you’ve likely encountered a frustrating Windows security feature: the file is “blocked,” preventing it from running or displaying correctly. This is due to the “Mark of the Web,” a security mechanism designed to protect you from potentially malicious content. PowerShell provides a simple and elegant solution to this problem: the Unblock-File cmdlet. This guide will explain what the Mark of the Web is, how to identify blocked files, and how to use Unblock-File to safely manage them. ...

Leaving and rejoining a Windows computer to an Active Directory (AD) domain is a common troubleshooting step, but it can lead to major headaches if not done correctly, especially in a modern hybrid environment. A common pitfall is being locked out of the machine, unable to log in with a local account because the device is still partially tied to a cloud identity like Azure AD (Microsoft Entra ID). This guide will walk you through the proper way to leave and rejoin a domain, and how to recover if you find yourself locked out. ...