Windows developers running Laravel's `php artisan serve` often hit a wall where ports 8000 through 8010 all fail. The issue isn't firewall or a corrupted project, but a specific PHP configuration default on many Windows builds. This common frustration halts local development for Herd, XAMPP, and custom PHP setups.

The root cause is the `variables_order` directive in php.ini, which defaults to "EGPCS" on some Windows PHP versions. Laravel prioritizes `$_SERVER` over `$_ENV`, and the incorrect order disrupts this. A simple change to `variables_order = "GPCS"` resolves it without reinstalling anything, restoring expected server behavior.

To fix it, run `php --ini` to locate your active php.ini file. Edit that single line, save, and restart your terminal. The development server will then bind successfully to 127.0.0.1:8000. While temporary command-line workarounds exist, correcting this core configuration is the definitive solution for stable local environments.