How to Reinstall Windows Security App (Microsoft Defender) - Fix ERR_CONNECTION_RESET by Clearing Browser Cache-Git Refusing to Merge Unrelated Histories: Fix

Updated 2026-07-28 10:31:38developer-tools

How to Reinstall Windows Security App (Microsoft Defender) - Fix ERR_CONNECTION_RESET by Clearing Browser Cache-Git Refusing to Merge Unrelated Histories: Fix

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.