Orion Passthrough authentication, IIS settings

We enabled passthrough authentication some time ago and it was working fine. At some point it stopped functioning correctly, it may have occured during one of the many patches and updates, but we aren't sure. I have revisited the instructions on how to set this up, but I ran into an odd situation. When I went into IIS to set verify and set the permissions, what i found was confusing and a possible problem. Within the Authentication screen of the "SolarWinds NetPerfMon" site I found the following:

Name                                      Status                         Response Type

Anonymous Authentication    Enabled                     

ASP .NET Impersonation       Disabled                    

Basic Authentication              Disabled                         HTTP 401 Challenge

Forms Authentication            Enabled                          HTTP 302 Login/Redirect

Windows Authentication        Enabled                          HTTP 401 Challenge

Alerts: "Challenge-based and login redirect-based authentication cannot be used simultaneously."

Now what should these settings be set to, to allow for Passthrough Authentication?