Fixing BitLocker DNS Error When Unlocking a Drive - How to Reinstall Windows Defender After Error 404-BitLocker 404 Troubleshooting Guide

Updated 2026-06-14 03:34:57office-tools
Fixing BitLocker DNS Error When Unlocking a Drive - How to Reinstall Windows Defender After Error 404-BitLocker 404 Troubleshooting Guide
Before changing system settings, save your work and note the exact error text so you can compare results after each step.

Extra verification checklist

  • Restart the affected app after changing permissions or configuration files.
  • Test the same workflow in a clean browser profile or a temporary user account.
  • Compare the result on another network if the error may be connection related.