title: ADFS 2.0 - How can I Debug "401 - Unauthorized"
body: <p>I setup a test Server 2008 box with Active Directory and ADFS 2.0.  I have an ASP.NET app which uses WIF to federate identity.  ADFS is configured to use Active Directory for identity info.  I used WIF to configure the client app to use the ADFS endpoint.</p>
  
  <p>When I attempt to load the ASP.NET app as a user from the browser I am redirected to the ADFS endpoint and am prompted for credentials.  I have attempted to login with several users accounts, even resetting passwords but the credentials never seem to be correct and a 401 Unauthorized is returned.  I can login to other systems successfully with the same credentials.</p>
  
  <p>I have enabled debug trace in verbose mode and enabled auditing in verbose mode but I can't find any errors or info to help me figure out the issue.</p>
  
  <p>How can I get more info to narrow down the problem?</p>
  
  <p>UPDATE:</p>
  
  <p>I found that this issue is caused by my testing environment.  My dev machine is on our corporate domain (acme.com).  I created two 2008R2 VMs for a test Domain Controller (notacme.com) and Web Server.</p>
  
  <p>If I attempt to access the website from a computer on the acme.com domain the error described above occurs.  If I attempt to access the website from a computer on the notacme.com domain it works.</p>
  
  <p>What can I do to access the website from a computer on the acme.com domain?</p>