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Fix Windows Defender SSL Certificate Errors After Update - Windows Defender Real-Time Protection Not Responding-Windows Store Error 0x80073cf9: Step-by-Step Fix Checklist

Updated 2026-06-15 08:19:56macos-help

Fix Windows Defender SSL Certificate Errors After Update - Windows Defender Real-Time Protection Not Responding-Windows Store Error 0x80073cf9: Step-by-Step Fix Checklist

Prepare

Execute

Validate

Document

Operational follow-up

Record the exact option, command, or setting that changed the result.
Keep a rollback note if the workflow affects shared files or team settings.

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