Why doesn't ASP.NET MVC work with Authentication Across Applications?

Question

ASP.NET

There are 2 web applications, one main from it and authorization goes, and the second should just pick up the cookie and work with the user. Both are hosted on localhost.
Everything seems to be set up normally and should work, but authorization does not work in the second one.
Request.Cookies has everything except .ASPXAUTH, although Request.Headers["Cookie"] has everything....
So what's wrong?
Set up as in msdn .

Answer 1

figured it out, the problem was in the httpRuntime targetFramework