Shared Printer Says Credentials Not Sufficient? Save Them
A shared printer says the credentials supplied are not sufficient, though the same login opens the PC’s folders? Save the login in Credential Manager instead.
Informational
Windows Passkey Can’t Be Deleted? Make a New One First
Windows says a passkey can’t be deleted because it’s required to sign in to this device? Save a new passkey for that account to Windows Hello, then delete it.
Edge Secure DNS Off for Managed Browsers? Clear the Policy
Edge says this setting is turned off for managed browsers on your own PC? A leftover policy makes Edge think it is managed. Check edge://policy, then delete it.
Update Error 0x800f0991? Run Three Commands in Order
Windows Update keeps failing with 0x800f0991? DISM RestoreHealth, sfc /scannow and DISM StartComponentCleanup, run in that order, let the update install.
Windows Wants a USB Security Key? Remake the Passkey
Windows Security asks you to insert a security key into the USB port, but you never had one? Windows Hello lost the passkey. Make a new one for that site.
SSH Post-Quantum Warning on a Mac? Silence It Per Server
SSH on macOS 26.3 warns the connection is not using a post-quantum key exchange? The server is old. Update it, or silence the warning for that host only.
Natural Scrolling Missing on a Mac? Check What Is Connected
Mouse and Trackpad settings gone, and natural scrolling with them? They only show when a mouse or trackpad is connected. Over remote desktop, the client decides.
External Drive Read-Only and Access Denied? Check Antivirus
Files on your external drive open read-only and copying says Access Denied? Check your antivirus first. One owner’s external drive protection was the cause.
Mac App Store Buy Button Missing? Nudge the Window
The Mac App Store opens a purchase sheet with no Buy or Install button? Drag the window partly off the screen and back, or turn off Hover Text.
FileVault Recovery Key Not in Passwords? Make a New One
Your Mac is missing from the Passwords app, so no FileVault recovery key? Turn FileVault off and on, or run fdesetup in Terminal, to make a new one.