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How to Fix Windows Security Proxy Error - Troubleshooting Windows Terminal Update Failure 0x800f0954-Reset Windows Defender Cache No Restart

Updated 2026-06-13 16:09:26browser-issues
How to Fix Windows Security Proxy Error - Troubleshooting Windows Terminal Update Failure 0x800f0954-Reset Windows Defender Cache No Restart
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.