How to Fix Outlook 'Connection Refused' Error from Antivirus Blocking - Troubleshoot Cloudflare Tunnel with This Checklist-Microsoft Store 404 Error: Causes and Fixes

Updated 2026-06-14 14:55:02office-tools
How to Fix Outlook 'Connection Refused' Error from Antivirus Blocking - Troubleshoot Cloudflare Tunnel with This Checklist-Microsoft Store 404 Error: Causes and Fixes
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.