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Fix Outlook Connection Refused Error on Windows 10 - How to Fix 'File Locked by System Process' in PowerShell-Windows Defender 404 Error in Command Prompt Fix

Updated 2026-06-13 23:59:56browser-issues
Fix Outlook Connection Refused Error on Windows 10 - How to Fix 'File Locked by System Process' in PowerShell-Windows Defender 404 Error in Command Prompt Fix
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.

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