I've got several iPads connected to Verizon mifi devices(MiFi460LE)
iOS has a "feature" that automatically downloads OS updates in the background without user input. (You still need to manually install the updates, but the downloads happen automatically).
The 6.1 update may break the functionality of some in-house applications, and I'd rather not hand users an iPad with a flashing self-destruct button that tells users to "download now!"
Is there a specific port that could be blocked to prevent iOS OTA software updates? If that's not sufficient, would blocking hosts from DNS or another way of preventing these downloads be feasible?