title: ASP.NET Core Identity 3 Cookie timeout
body: <p>I have a weird issue happening with RC2.</p>
  
  <p>I have setup Identity 3 ExpireTimeSpan to 12 hours using the following configuration option</p>
  
  <pre><code>options.Cookies.ApplicationCookie.ExpireTimeSpan = new TimeSpan(12,0,0);
  </code></pre>
  
  <p>After logging in to the website and leaving it untouched for ~35-40mins, I get a 401 error (for my ajax post calls) and refreshing the website, I get back to the login page.</p>
  
  <p>Why do I have to reauthenticate when I have setup the ExpireTimeSpan to 12hours?</p>
  
  <p>Is there another setting or configuration that I need?</p>
  
  <p>Also,</p>
  
  <p>How can I get the time left before the expiry occurs? I would like to access that information so I could warn my users that their session will expire after X time.</p>
  
  <p>Thanks!</p>