Solution : Make sure the network cable is plugged in. Some machines will not present an option to input IP settings until they sense activity on their network adapters.
If you find you no longer can connect to your work, school or from a particular Hotspot it could be due to them (the network) no longer has the port (door) opened that allows the type of vpn traffic your device is using in its attempt to connect. As it relates to this post, I'm more specifically referring to connections that use the PPTP vpn protocol (Windows, Mac... etc). 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 particular bubble I leave in, but it sure seems like there was not much lead time (notice) regarding the impending switch... weeks maybe? Apple users need to take particular note ... As of iOS 10, PPTP vpn connects are no longer supported from any of their devices. I speak a bit more on this here .