تنظیمات کانفیگ iis این مشکل رو دیدم

The server is configured to use pass-through authentication with a built-in account to access the specified physical path. However, IIS Manager cannot verify whether the built-in account has access. Make sure that the application pool identity has Read access to the physical path. If this server is joined to a domain, and the application pool identity is NetworkService or LocalSystem, verify that <domain>\<computer_name>$ has Read access to the physical path. Then test these settings again.

از چی میتونه باشه ؟

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ممنون از دوستان عزیز . با remove کردن iis و نصب دوباره مشکلم حل شد.

مشکل دانلود در اندروید هم با تغییر
Mime Type به application/octet-stream حل شد

با تشکر از T.Toosi و m_dg_farari