title: ADFS 2.0 IDP-Initiated SSO
body: <p>I am attempting to set up a test configuration for IdentityProvider-Initiated SSO using ADFS 2.0 as my RP STS and a SAML 2.0 identity provider. Here is my set up:</p>
  
  <p>Identity Provider - SAML 2.0 token issuing website using the ComponentSpace SAML v2.0 .NET plugin.</p>
  
  <p>RP STS - ADFS 2.0 instance with an RP trust relationship with my asp.net application.</p>
  
  <p>RP Application - ASP.NET web application (WIF) with an STS reference to my ADFS 2.0 STS.</p>
  
  <p>So what happens is that the user logs into the Identity Provider website and is authenticated. They are then given a link to the RP STS. This link (from what I understand) should use RelayState to tell the RP STS which application the user needs to be forwarded to. I know I need to create some kind of trust between ADFS and my IP web portal, but I don't know what that might be. My issue is I can't find any good resources for instructions on how to do this. Most of what I find assumes that ADFS is also the Identity Provider and is configured as a SAML 2.0 endpoint. Is what I'm trying to do impossible or am I just not finding the right resources?</p>
  
  <p>Thanks!</p>