2016-08-07 iOS 9.x VPN problem no access 問題 http://www.gottabemobile.com/2016/08/04/ios-9-3-problems-5-things-you-need-to-know/http://www.zdnet.com/article/ios-9-breaks-vpns-and-how-to-fix-it/http://www.infoworld.com/article/2984351/virtual-private-network/ios-9-breaks-vpns-prevents-server-access-for-many.htmlhttp://fieldguide.gizmodo.com/how-to-downgrade-ios-9-3-to-an-older-version-1767689167http://osxdaily.com/2015/09/16/downgrade-ios-9-back-to-ios-8-4-1/