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How to Fix Cloudflare Error 525: SSL Handshake Failed - How to Unlock a File Locked by Windows Defender-Fix Windows Security Antivirus Not Turning On

Updated 2026-06-13 14:36:11office-tools
How to Fix Cloudflare Error 525: SSL Handshake Failed - How to Unlock a File Locked by Windows Defender-Fix Windows Security Antivirus Not Turning On
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.