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How-to

11
  • How to add or reset your Microsoft 365 sign-in verification method (MFA)
  • How to find which program is using a port, and stop it
  • How to find your BitLocker recovery key, and back it up before you need it
  • How to flush the DNS cache and test name resolution
  • How to free up disk space on Windows
  • How to make a bootable Windows 11 USB installer
  • How to repair Windows system files with SFC and DISM
  • How to run a script on a schedule with Task Scheduler and PowerShell
  • How to set up SSH key login and turn off password login
  • How to turn on Remote Desktop safely on Windows 11
  • Power Automate: Forms checkbox answers arrive as one run-together line
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Troubleshooting

18
  • “The trust relationship between this workstation and the primary domain failed”
  • apt / dpkg: “Could not get lock /var/lib/dpkg/lock-frontend” on Ubuntu and Debian
  • Blue screen INACCESSIBLE_BOOT_DEVICE (stop code 0x7B): Windows cannot reach its own disk
  • Classic Outlook stuck on “Loading Profile”: how to get it open without losing mail
  • Edge error 1714 / 1612: “The older version of Microsoft Edge cannot be removed”
  • Entra ID error AADSTS50020: “User account from identity provider does not exist in tenant”
  • Failed to mount /dev/mapper/root on real root: fixing btrfs “parent transid verify failed”
  • Group Policy Event ID 1053 / 1055: “Windows could not resolve the user name” (name resolution failure)
  • Kerberos clock skew: “There is a time and/or date difference between the client and server” (KRB_AP_ERR_SKEW)
  • New Microsoft Teams shows a blank window or loads forever: how to fix it
  • Office 365 sign-in: “Oops, something went wrong”
  • OneDrive stuck on “Processing changes” for hours
  • Outlook error 0x800CCC0E: “Cannot connect to the server” on an IMAP account
  • PowerShell: “running scripts is disabled on this system” (execution policy)
  • Print Spooler keeps stopping: “The RPC server is unavailable” (0x000006ba)
  • SSH: “WARNING: REMOTE HOST IDENTIFICATION HAS CHANGED!” and “Host key verification failed”
  • Wi-Fi says “No internet, secured”: connected to the router but nothing loads
  • Windows Update error 0x80070002 or 0x80070003: update fails or will not install
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Security

  • How to turn on Remote Desktop safely on Windows 11
  • How to set up SSH key login and turn off password login
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