Requiring Client Authentication
By default, Microsoft SQL Server 2005 Analysis Services (SSAS) requires clients to be authenticated by the Microsoft Windows operating system and to reject all requests from unauthenticated clients. In an environment where data security is not an issue, Analysis Services can be configured to accept requests from unauthenticated clients. For example, if the data in the cube is intended to be widely shared and accessible by anyone, client authentication is not necessary.
If appropriate in your environment, you can configure Analysis Services to accept requests from unauthenticated clients by using SQL Server Management Studio to change the value of the Security \ RequireClientAuthentication server configuration property from its default value of 1 to 0. Changing this property from its default value will reduce the security of your Analysis Services data. To access this property, right-click the instance of Analysis Services, click Properties, and then locate this property on the Security page.