what is:
you must authorize with the signing server before making this request
can't find nothing about it in google nowhere.
my iTunes keep saying this stupid thing over and over my iPad is stuck with a iTunes sign and wire now.
***
[Edited by Host]
Did you buy this iPad second hand? If so Turn off Find My iPhone Activation Lock - Apple Support (it applies to iPad as well)
Similar issue: Ipad stuck on "sign into apple id" prompt
Other relevant documentation:
If you see the Connect to iTunes screen on your iPhone, iPad, or iPod touch - Apple Support
signing server
