Fix Windows Security Error 0x80073b01: Step-by-Step Guide - Fix Windows Terminal Not Connecting Post-Update-Fix Proxy Configuration Blocking Windows Defender

Updated 2026-06-13 15:43:02windows-fixes
Fix Windows Security Error 0x80073b01: Step-by-Step Guide - Fix Windows Terminal Not Connecting Post-Update-Fix Proxy Configuration Blocking Windows Defender
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.