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How to Fix Windows Defender Firewall Blocked App - How to Resolve 504 Error from Windows Firewall-Windows Defender Command Prompt Access Denied Solution

Updated 2026-06-13 16:03:26office-tools
How to Fix Windows Defender Firewall Blocked App - How to Resolve 504 Error from Windows Firewall-Windows Defender Command Prompt Access Denied Solution
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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