The Network access: Sharing and security model for local accounts setting should be configured correctly. This policy setting determines how network logons that use local accounts are authenticated. The Classic option allows precise control over access to resources, including the ability to assign different types of access to different users for the same resource. The Guest only option allows you to treat all users equally. In this context, all users authenticate as Guest only to receive the same access level to a given resource. Fix: (1) GPO: Computer Configuration\Windows Settings\Security Settings\Local Policies\Security Options\Network access: Sharing and security model for local accounts (2) KEY: HKLM\System\CurrentControlSet\Control\Lsa\ForceGuest