SSH Host Key Changed? Verify It Before Fixing known_hosts
An SSH host-key warning can mean a rebuilt server or an impostor. Learn how to verify the fingerprint and safely update one known_hosts entry.
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Cybersecurity
Posts filed under Cybersecurity, newest first.
Fake CAPTCHA scams: why a website asks you to press Windows + R
A fake human check can turn a routine click into a command on your PC. Learn the warning signs and what to do if you saw, copied or ran one.
SPF, DKIM and DMARC: Set Up Email Authentication Without Breaking Mail
Set up SPF, DKIM and DMARC without breaking legitimate email. Learn DNS records, alignment, real-message checks and what the 2026 standard changed.
PowerShell says scripts are disabled? Check this first
If PowerShell says running scripts is disabled, inspect the effective policy first. Learn what each scope means, why a downloaded file can be blocked, and when to ask IT.
Steam account hacked? Secure it before you recover it
If you spot an unfamiliar Steam sign-in, trade or purchase, secure the device and email behind your account first. Then use Steam Support's recovery route, revoke unknown sessions and check what happened.
Windows Firewall prompts: should you allow the app?
A Windows Firewall prompt asks whether an app may receive network traffic. Learn when it needs an exception, what Private and Public mean, and how to revoke access later.
Windows Secure Boot certificates: what to check in June 2026
Two 2011 Secure Boot certificates are due to expire in June 2026, with another in October. Learn what the dates mean, where to check your PC's update status, and when to contact its manufacturer.
How to check a downloaded app's digital signature in Windows
Check a Windows installer’s Authenticode signature, compare its signer with the official publisher, and understand why a valid signature may still trigger a SmartScreen warning.
Reset a Windows 11 PC Before Selling It: What to Back Up, Wipe and Check
Back up your files, choose the right Windows 11 reset settings, clean the drive for an ordinary sale and check what remains in cloud accounts.
Password manager hacked? What an encrypted vault can and can’t protect
A password-manager breach may expose encrypted vault data, a stolen sign-in or an unlocked device. Learn what each means and what to do next.
What browser Secure DNS protects, and what it doesn’t
Secure DNS encrypts a browser’s lookup to a resolver, but the resolver still receives it. Learn what Chrome and Firefox protect, how fallback works and when to leave network controls alone.
How to Use Windows Quick Assist With Someone You Trust
Quick Assist can show a trusted helper your Windows screen and, with a second approval, let them control the PC. Learn how to arrange a session, limit what is visible and disconnect.
Smart App Control in Windows 11: Check Before You Turn It Off
Before changing Smart App Control, check its Evaluation, On or Off state and whether Windows 11's January 2026 switching update has reached your PC.
A QR code in your work email? Check it before you scan
A QR code in a work email can move a sign-in from your PC to a phone. Learn how to verify the request, inspect the destination and respond if you already scanned it.
Windows 10 support has ended: choose your next step
Windows 10 support ended on 14 October 2025. Check Windows 11 eligibility and, if you need more time, whether your PC qualifies for consumer ESU through 12 October 2027.
Windows Controlled Folder Access: What It Protects and How to Use It
Controlled Folder Access lets trusted apps change files in protected Windows folders. Learn how to enable it, check that your usual apps still save, and handle a block without approving the wrong program.
7-Zip CVE-2025-0411: Update to Fix the Mark-of-the-Web Bypass
Older 7-Zip releases could drop Windows’ internet-origin marker from files in nested archives. Check for version 24.09, understand the user interaction involved, and know what an update cannot undo.
Find your BitLocker recovery key before you need it
Find your Windows recovery key, match the correct ID and keep an accessible backup outside your PC, with guidance for personal and work accounts.
Windows 11 Memory Integrity: What It Protects and Driver Warnings
Memory Integrity helps protect Windows 11’s kernel, but an incompatible driver can stop a device working. Check the setting, identify the driver and find the safe update path.
Why CrowdStrike’s July 2024 content update crashed Windows
A cause-focused account of the 2024 outage: how faulty Rapid Response Content passed validation, crashed Windows and exposed gaps in error handling and rollout.