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How to Fix Command Prompt Error 0xc0000142 on Windows 10 - Windows Defender Service Startup Type Error Guide-Resolve Cloudflare 521 Error: Server Connection Refused

Updated 2026-06-14 16:11:20developer-tools
How to Fix Command Prompt Error 0xc0000142 on Windows 10 - Windows Defender Service Startup Type Error Guide-Resolve Cloudflare 521 Error: Server Connection Refused
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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