If you find you no longer can connect to your work, school or from a particular Hotspot it could be due to you upgrading to Apple's iOS version 10.X or greater... or because you simply purchased a new Apple device.
Apple's operating system (iOS) as of iOS 10 now no longer supports PPTP vpn type connections. More on this from Apple directly...
https://support.apple.com/en-us/HT206844
Consequently, the remote hotspot (network) from where you are trying to connect may no longer have the port (door) opened that allows PPTP traffic. After all, why keep a port open that's no longer needed on your network?
Apple switched for good reason... the PPTP protocol is now considered more vulnerable from a network security perspective than several other current VPN alternatives. In many cases, it's been causing headaches for Network Administrators who should have migrated from its use by now. Perhaps it's due to the bubble I leave in, but it sure seems like there was not much lead time (notice) regarding warnings for the impending change.
Apple's operating system (iOS) as of iOS 10 now no longer supports PPTP vpn type connections. More on this from Apple directly...
https://support.apple.com/en-us/HT206844
Consequently, the remote hotspot (network) from where you are trying to connect may no longer have the port (door) opened that allows PPTP traffic. After all, why keep a port open that's no longer needed on your network?
Apple switched for good reason... the PPTP protocol is now considered more vulnerable from a network security perspective than several other current VPN alternatives. In many cases, it's been causing headaches for Network Administrators who should have migrated from its use by now. Perhaps it's due to the bubble I leave in, but it sure seems like there was not much lead time (notice) regarding warnings for the impending change.
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