You are not trying to access your website, you are trying to access the XAMPP Administration page or any other sensitive part of XAMPP. These sites are protected from public access due to security reasons.
Your Website should be anywhere inside your htdocs folder exept the xampp folder. e.g. your website is in \xampp\htdocs\website\ you can access it by http://ip-address-of-your-xampp/website/
best wishes, Altrea
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