I have a mvc4 application and uses forms authentication in my web.config file , at IIS level have enabled Anonymous and Forms authentication , my website is running on https by default . But the problem is i am getting window authentication popup asking for username and password on some of the webpages , rest are workng fine .
here is my authentication tag from web.config
<authentication mode="Forms">
<forms name=".YAFNET_Authentication"
protection="All" timeout="43200" cookieless="UseCookies" />
</authentication>