Provides administrative services for IIS, for example configuration history and Application Pool account mapping. If this service is stopped, configuration history and locking down files or directories with Application Pool specific Access Control Entries will not work. Fix: (1) GPO: Computer Configuration\Windows Settings\Security Settings\System Services!Application Host Helper Service (2) REG: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\services\apphostsvc!Start