Enterprise and BYOD users beware - upgrading to iOS 9 can break your ability to access VPNs.
The symptoms are pretty straightforward - you upgrade to iOS 9 and are then you find that you are no longer able to connect to some servers over VPN because of failed DNS resolutions.
Internal connections to servers from corporate networks are unaffected.
While the bug has been documented by Cisco, the bug itself is not Cisco-specific and affects other clients, even iOS's own built-in VPN client.
We have noticed a couple of OS regressions between iOS 8.4.1 and iOS 9 which have been reported to Apple. Most notable is that when doing Split Tunneling, the Tunnel All DNS option no longer functions as expected. This was reported to Apple under Radar # 22558059. This is not resolved in the iOS 9 release.
The current beta release of iOS 9.1 is also affected.
If you've upgraded to iOS 9 and you can't wait for Apple to fix this issue then your only hope is to roll back to iOS 8.4.1. But there's a catch - you can only do this if you made a backup of your device via iTunes (not iCloud) before carrying out the upgrade.
If you do have an iTunes backup then connect your device to iTunes and then Alt-click/Option-click the Restore Backup button from the iTunes Summary window. Now go looking for the appropriate .ipsw backup file. Hopefully, iTunes hasn't been "helpful" and automatically purged it from your computer to make room for a new backup. If it has then you might be able to recover it from a backup.
If it has been purged, or you didn't make a backup before you upgraded, then you can download the applicable file from Apple (links available here), but bear in mind that your device will be factory reset if you use this file.
See also:
iOS 9 breaks VPNs, and here's how to fix it. Enterprise and BYOD users beware - upgrading to iOS 9 can break your ability to access VPNs.
iOS 9 breaks VPNs, and here's how to fix it
Enterprise and BYOD users beware - upgrading to iOS 9 can break your ability to access VPNs. [IMAGE]
iOS 9 breaks VPNs, and heres how to fix it | IT Security News
Enterprise and BYOD users beware upgrading to iOS 9 can break your ability to access VPNs. Full article:iOS 9 breaks VPNs, and heres how to fix it Share this
iOS 9.0.1: Let the bug-fixing begin | ZDNet
iOS 9 breaks VPNs, and here's how to fix it; Apple posts fix for iOS 9 'Slide to Upgrade' bug; iOS 9 'Software Update Failed' error hits iPhone and iPad owners;
iOS 9 breaks VPNs, and heres how to fix it | Virus ...
Enterprise and BYOD users beware upgrading to iOS 9 can break your ability to access VPNs. Read more: iOS 9 breaks VPNs, and heres how to fix it
iOS 9 breaks VPNs, prevents server access for many | InfoWorld
iOS 9 breaks VPNs, prevents server access for many. More like this. How to prepare your devices for iOS 9. Here's what Cisco has reported about the bug:
iOS 9 breaks VPNs, and heres how to fix it | The Computer Man
Enterprise and BYOD users beware - upgrading to iOS 9 can break your ability to access VPNs. Continue Reading
Apple's iOS 9 Breaks VPNs - Slashdot
Now iOS 9 breaks VPN support. while people like us understand what's going on here, Switched from Android to iOS because Google won't fix their Bluetooth stack.
Read news related to Break - Page no. 29
iOS 9 breaks VPNs, and here's how to fix it. zdnet Technology Sep 21, 2015. Enterprise and BYOD users beware - upgrading to iOS 9 can break your ability to access VPNs.
How to downgrade your iPhone/iPad from iOS 9 beta to iOS 8.3
So, you've jumped on the iOS 9 beta train? Despite that is nowhere near suitable for a daily driver, the developer preview is doing its job impeccably, i.e. it's