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I have a custom SL4 app, that fails in a Test Environment. The app is configured with Windows Auth, and the App Pool is a Domain (service) Account.
This worked as configured and then something environmental change and now the site doesnt consume the Windows Credentials automatically through IIS8. I get prompted (401.1) for creds. After 3 failures I get a 401.2. I am not sure if this is Kerberos related. or if its in my web.config.
Anyone have any ideas??
Answering my own question here:
This article got me going in the right direction
http://support.microsoft.com/kb/907273
Essentially this was a failure in configuration between my IIS, the Authentication settings and the Bindings on my RIA Service. I removed any Binding Configuration I had in the config file for the RIA service and then I made sure that only one auth type was configured in IIS.