title: ASP.NET redirecting users credentials to regional sites
body: <p>we have two identical websites. One located at apac.ourdomain.com and the other at eu.ourdomain.com. The only differences about these websites are one is hosted in Australia, and the other is in London. The databases they backed onto have identical schema, except one is in Australia, and the other is in London, each storing data related to our partners in the region.</p>
  
  <p>What we want to do is implement some form of centralise landing page @ www.ourdomain.com using forms authentication. Once a partner logs on to www.ourdomain.com, we will redirect them to either the apac or the eu server. My challenge is how do I transfer the user credentials from the landing site to the regional site? By Credentials, I mean everything from their username to their roles / permissions. And once a user is redirected to the regional site, how do i get them back to the landing site should they required to modify their details?</p>
  
  <p>I know I will need to have a centralised user details db for the landing site, but it is the communication to and from the regional site afterward that I'm uncertain about. Any pointers?</p>