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 tagged 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.
Stop unwanted website notifications in Chrome, Edge and Firefox
A website can send browser notifications that look like system alerts. Identify which browser delivered one, block that site’s permission, and tell notifications apart from pop-ups and Windows app alerts.
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.
BitLocker recovery after a BIOS update: what to do next
BitLocker can ask for its recovery key after a BIOS or UEFI change because the TPM sees a different startup state. Learn what to check now and how to prepare before the next update.
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.
Try an app in Windows Sandbox without keeping the install
Try a Windows utility in a disposable desktop. Set up offline access, share only read-only input, and check what disappears when Windows Sandbox closes.
Use a Standard Account in Windows 11 Without Losing Admin Access
Use a standard account for Windows 11 day-to-day tasks, keep a separate administrator account for system changes, and handle elevation prompts safely.
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.
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.
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.
Windows Dynamic Lock: set it up and test its limits
Pair a phone over Bluetooth, turn on Windows Dynamic Lock, and test what happens when you leave. Learn why signal strength and PC activity affect when it locks.
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.