Hi Kelemen Balázs,
Please use this instead:
<system.webServer>
<applicationInitialization doAppInitAfterRestart="true">
<add initializationPage="/" />
</applicationInitialization>
</system.webServer>
==> Preload + AlwaysRunning: You've enabled both but make sure it's under the correct <site> config in applicationHost.config or via IIS Manager:
- Go to Advanced Settings for the App Pool
- Set Start Mode to AlwaysRunning
- Set Preload Enabled to True for the site
==> Once updated, restart the App Pool and run: curl http://localhost/
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