title: IIS7 integrated mode closing token between requests
body: <p>We are migrating to IIS7 integrated mode and have come across an issue. We authenticate using WindowsAuthentication but then store a reference to the WindowsPrincipal so that on future requests we can authorize as needed against AD. In IIS 7 Integrated mode, the token is being closed (between requests) so that when we try to run IsInRole it generates a disposed exception. Is there a way to cache this token or change our use of WindowsPrincipal so that we don't need to make successive AD requests to get it for each authorization request?</p>
  
  <p>Here is the exception being thrown from WindowsPrincipal.IsInRole("")
  - System.ObjectDisposedException: {"Safe handle has been closed"} </p>
  
  <p>Thanks.</p>