title: Forms Authentication across Sub-Domains
body: <p>Is it possible to authenticate users across sub-domains when the authentication takes place at a sub-domain instead of the parent domain? </p>
  
  <p>For example:</p>
  
  <p>User logs into site1.parent.com, and then we need to send them to reporting.parent.com.</p>
  
  <p>Can I authenticate them to the reporting site even though the log-in occured at a sub-domain?</p>
  
  <p>So far all of the research I have done has users logging into the parent domain first and then each sub-domain has access to the authentication cookie. </p>