We have successfully developed an ios MDM solution. The problem we face now is, the MDM push notifications(the wake up call step) is not receiving on a few iOS devices, but works very well for other iOS devices.
I had already searched for this issue on the forums. Most of them said that if the device is behind Wifi, or any other restricted network which block the apple ports, then the push will not be received. But these devices are not receiving the notification even from 3g network. Is there any thing that need to be enabled / disabled in the device for it to receive the push notification ie. the wake up call from the Apple server?