Hi I can't get the following to work on either iis 7.0 or 7.5, my configuration is: App pool is set to v4.0 (.NET Framework), Integrated My site under Authetication: ASP .NET Impersonation: Enabled Windows Aithentication: Enabled On server IIS: ISAPI and CGI Restrictions ASP .NET v4.0.30319 Allowed (for both x86 and x64) and SPN is also set like this: setspn -a http/sitename.domainname.xyz domainame\servername$ setspn -a http/sitename domainame\servername$ The error i get is: 500 - Internal server error Tracing on 500 gives this result: ModuleNameConfigurationValidationModule Notification1 HttpStatus500 HttpReasonInternal Server Error HttpSubStatus24