We have been reviewing security on our Web application hosted on a Winhost Server. The advice we seem to be seeing is to add <system.web> <deployment retail="true"/> </system.web> to our web.config file. When we do this, we get the following: Server Error in '/' Application. Configuration Error Description: An error occurred during the processing of a configuration file required to service this request. Please review the specific error details below and modify your configuration file appropriately. Parser Error Message: It is an error to use a section registered as allowDefinition='MachineOnly' beyond machine.config. Source Error: An application error occurred on the server. The current custom error settings for this application prevent the details of the application error from being viewed remotely (for security reasons). It could, however, be viewed by browsers running on the local server machine. Source File: E:\xxx\xxx\web.config Line: 16 I would love some suggestions on what we're doing wrong.