An anonymous reader writes with a report from The Stack that researchers have discovered a crucial security problem in the latest version of iOS 9: it breaks VPN connections to corporate servers. According to the linked piece, "The flaw was first detected in the iOS 9 beta, and has not been fixed in the released version. Neither has the bug been removed in the current iOS 9.1 beta." The workaround might not be what you want to hear, either, if you've happily upgraded to the latest version: it's to downgrade to iOS 8.4.1.
http://it.slashdot.org/story/15/09/2...-9-breaks-vpns