If this does not allow the connection, then it seems your current network is blocking the connection ports used by the i OS app.
In such a case, a different VPN setup would be required.
The best bet to try (though you might already try) is to sign out and log in your Apple ID again. Please check out whether your i Device has been updated to the latest version. If it's a bug, then it is possibly solved in the latest i OS. Swipe down to the bottom and choose "Reset" option. Select "Reset Network Settings" and enter your passcode if prompted. Confirm the attempt by tapping on "Reset Network Settings" again. I'm thinking of switching from Sprint to Verizon due to the limited service on the Sprint network where I just moved to. Used my 5-day old i Phone 5c and noticed charge was at 50%.I have an i Phone 5s and 5c on the account, can I use both of those phones with Verizon or do I have to buy new phones? Do I have to remove sim card after I backup to i Tunes and put it in the new phone? Fifteen minutes later tried to turn it on to use it, and it was dead. Then, open i Tunes on your computer and select your i Phone from the top left the menu. On your Mac: you need to hold the OPTION and Command Key then click the “Restore” button. If you still can't update your device, try using a different Wi-Fi network and computer. Assuming these tricks have helped you troubleshoot this issue. Connect your device to your computer using a USB cable.
“An unknown error occurred (9006).”i Tunes error 9006 could crop up due to more than one reasons such as lack of proper internet connection, faulty USB port etc.