It requires you to enter the passcode to acquire permission to go into your device, but you cannot enable the authorization as you forgot the passcode. You get another error message saying that iTunes doesn't recognize disabled iPhone as it's locked by a passcode. This is a common problem as iTunes won't recognize your device if it's never been synced to there before being disabled.
You get 'To allow access, please respond to your iPhone' message when connecting disabled iPhone to iTunes, but you can do nothing to undisable the phone except make emergency calls. The frustrating 'iPhone is disabled and won’t connect to iTunes' issue involves: My iPhone is disabled and won't connect to iTunes However, the disabled iPhone won't connect to iTunes (or Finder on newer Mac) or computer.
Aiming to get past the grey screen saying white 'iPhone is Disabled' with waiting time or with 'Connect to iTunes' message and fix the disabled iPhone, you connect it to iTunes. As a result of forgetting passcode, you have disabled your iPhone after attempting possible 4 or 6 number combinations to unlock the device.
