Some of us weren’t expecting the jailbreak to be closed so soon for iOS 9 - 9.0.2 but it seems that Apple has indeed killed off the Pangu for iOS 9 jailbreak in iOS 9.1. If you haven’t updated to iOS 9.1 and still not jailbroken; well, it is pretty simple. Don’t install iOS 9.1 on your iPhone, iPad or iPod touch.
Generally Apple takes sometime before killing off a jailbreak, this maybe due to various reasons but this time, Apple has accelerated its pace. Hardly after being released for a week, Pangu for iOS 9 has been brought down by the Apple engineers.
In its security release notes Apple has mentioned that it has closed two bugs which Pangu exploited to jailbreak iOS 9 and these were relating to Kernel (obviously).
Now it is a bit obvious that if you want to keep your jailbreak do not update to iOS 9.1, as there is no current information on when iOS 9.1 jailbreak will be released.
The best thing to do now is just to hold off on updating any of your devices until Pangu releases a jailbreak for iOS 9.1.