title: SSO for DNN websites
body: <p>My requirement is this:</p>
  
  <p>I have a DNN website www.websiteA.com.</p>
  
  <p>I want to build www.websiteB.com and www.websiteC.com on the same DNN installation. www.websiteB.com and www.websiteC.com should allow users of www.websiteA.com to login with the same username and password.</p>
  
  <p>When a user logs in to www.websiteA.com, and then navigates to www.websiteB.com or www.websiteC.com, they shouldn’t have to login again as they are already logged in to the main website.</p>
  
  <p>I found modules that will let me share users between these websites, such that they can login to any of the three websites using the same credentials.
  However, I cannot find a way to login a user to all websites simultaneously, so that the user does not have to login again.</p>
  
  <p>I would prefer to do this without modifying the DNN source too much. Since all three websites are on the same DNN installation, I was hoping there would be a way to share authentication cookies, but I haven't found any yet.</p>
  
  <p>Can anyone provide me more direction in this matter? Thanks!</p>