How to Fix Windows Defender Service Not Running - Troubleshooting Windows Security DNS Not Working-Fix Windows Defender Network Connection Issues

Updated 2026-06-13 14:22:08browser-issues
How to Fix Windows Defender Service Not Running - Troubleshooting Windows Security DNS Not Working-Fix Windows Defender Network Connection Issues
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.