GCM registration is not ready with auth credentials in ios9

Question

Hi i am using GCM for push notification, it is working fine in iOS8 but in iOS9 it is giving error \"GCM registration is not ready with auth creden

Answer 1

i had the same problem and as I understand, there are multiple possible reasons. But here is one that I have not found documented yet. And it is a nasty one.

To test a feature of our software, we were advancing our devices clocks. And we learned the hard way:

If your devices clock is off by too much, you will get "com.google.gcm error 501" form the GCM farmework.