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Home / cloud-software / Cloudflare Tunnel Setup Guide for Beginners - How to Resolve Windows Security Error 0x80073b01-Windows Defender Update Fails with 0x80070643

Cloudflare Tunnel Setup Guide for Beginners - How to Resolve Windows Security Error 0x80073b01-Windows Defender Update Fails with 0x80070643

Updated 2026-06-13 19:50:16cloud-software
Cloudflare Tunnel Setup Guide for Beginners - How to Resolve Windows Security Error 0x80073b01-Windows Defender Update Fails with 0x80070643
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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