Allows UPnP devices to be hosted on this computer. Universal Plug n Play (UPnP) is a real security risk - it allows automatic discovery and attachment to network devices. Notes that UPnP is different than regular Plug n Play (PnP). Workstations should not be advertising their services (or automatically discovering and connecting to networked services) in a security-conscious enterprise managed environment Default: Manual. Counter Measure: The recommended state for this setting is Disabled. Potential Impact: Any hosted UPnP devices will stop functioning and no additional hosted devices can be added. Fix: (1) GPO: Computer Configuration\Windows Settings\Security Settings\System Services\UPnP Device Host (2) REG: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\upnphost!Start