The remote host is missing a critical Apple iOS patch update.
Versions of Apple iOS 9.x prior to 9.0.2 are affected by an authorization bypass vulnerability. This is due to a flaw in the Lock Screen behavior when a specific sequence of events takes place. Successful attempts to exploit and bypass the lock screen will result in unfettered access to the device as well as any of its saved content.
Upgrade to Apple iOS 9.0.2 or later.