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Fix Windows Defender Proxy Error: Permission Denied - PowerShell Reset for Windows Security Issues-Cloudflare Error 521: Web Server Down Troubleshooting Guide

Updated 2026-06-13 14:26:48macos-help
Fix Windows Defender Proxy Error: Permission Denied - PowerShell Reset for Windows Security Issues-Cloudflare Error 521: Web Server Down Troubleshooting Guide
Likely symptom
Likely cause
Safe rollback

Verification route

  • Repeat the original action, not only a simplified test case.
  • Restart the app or reload the service after configuration changes.