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Fix Windows Security Blank Screen: Step-by-Step Guide - Resolve RDP Error 0x4: Credentials Did Not Work-Windows Defender Won't Start? Fix It Now

Updated 2026-06-13 11:56:58developer-tools
Fix Windows Security Blank Screen: Step-by-Step Guide - Resolve RDP Error 0x4: Credentials Did Not Work-Windows Defender Won't Start? Fix It Now
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.

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