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Fix Windows Defender Authentication Failed Error in Windows 10 - Resolve Windows Terminal Version Mismatch Error-How to solve 'cannot connect to localhost' in Windows Terminal

Updated 2026-06-13 17:07:28browser-issues
Fix Windows Defender Authentication Failed Error in Windows 10 - Resolve Windows Terminal Version Mismatch Error-How to solve 'cannot connect to localhost' in Windows Terminal
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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