IE11(Preview) User-Agent causes ASP.Net do not send back Set-Cookie

Solution

1. Waiting for MS hotfix. (http://support.microsoft.com/kb/2600088 for IE10)
2. Add cookieless=”UserCookies”

e.g.
<authentication mode="Forms">
  <forms name="yourAuthCookie" cookieless="UseCookies" loginUrl="login.aspx" protection="All" path="/" />
</authentication>