Fix npm run build Failure from Missing Env Variables - Resolve ERR_CONNECTION_RESET by Resetting Proxy Settings-How to Restore Missing Windows Taskbar Icons
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.