401.2 - Logon failed due to server configuration.

I have set up a new server, and there are 3 flex applications on there that can't get session variables and gives this error.  I have this working on two other servers, but I don't know where the configuration might be wrong on the server.  The app uses getAuthUser() to authenticate with AD, and server is setup as Integrated Windows Authentication.All of the CFM work, only the SWF are getting the error.