title: How to set expiration date for ASP.NET_SessionId cookie?
body: <p>Here's how I have authentication configured in web.config:</p>
  
  <pre><code>&lt;authentication mode="Forms"&gt;
        &lt;forms loginUrl="~/Account/Sigin" 
               name="MYCAUTH" 
               timeout="3000"  /&gt;
  &lt;/authentication&gt;
  </code></pre>
  
  <p>How can I make both <code>MYCAUTH</code> and <code>ASP.NET_SessionId</code> cookies use expiration?</p>