Do I have to register my protection order in New York in order to get it enforced?
No. According to federal Law,* all states, including New York, must enforce an out-of-state protection order. It does not have to be entered into the state or federal registry in order to be enforced by a New York police officer, but the officer does need to believe that it is a valid (real) order.**
* 18 USC § 2265
** NY CPL § 140.10(b)(ii)