Fix Windows Certificate Error 0x800b0109 - Checklist for Windows Defender Slowness-How to Stop Windows Defender from Turning Off
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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