How to Fix Windows Defender Threat Service Stopped - Resolving Outlook Setup Error 0x80040115-Solving Cloudflare Tunnel Permission Denied Issues

Updated 2026-06-14 19:54:59browser-issues
How to Fix Windows Defender Threat Service Stopped - Resolving Outlook Setup Error 0x80040115-Solving Cloudflare Tunnel Permission Denied 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.