Hi tsakumar81,
Are you using forms authentication?
If you have a forms element then, you need to add the requireSSL attribute to true in the forms element as well.
<system.web>
<httpCookies httpOnlyCookies="true" requireSSL="true" />
<authentication mode="Forms">
<forms requireSSL="true">
</forms>
</authentication>
</system.web>