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That's not AspDotNetStorefront authentication, that's something you had configured in the IIS. It seems to me that you had it set to Windows Authentication instead of Anonymous.

You can re-set...

Can you post the URL of your site so I can try? There is no login popup box, so that might be a customization issue.

There is no appconfig for that, but you can simple to do in your web.config file. Find this lines:

<authorization>
<allow users="*" />
</authorization>

...and change it to
...