I stuck at IOS push notification these few days. Here is my scenario:-
Using Easy APNS Provider and push notification by using aps.cer (download from App ID > Production SSL Certificate) , it can receive successfully.
Using APNS & GCM Online Tester and push notification by using .pem file (generated in keychain > export to .p12 > convert to .pem file) , it can receive successfully.
Using Push Tester and push notification by using .pem file (same as above), an error message will be shown as below.
When putting the .pem file in my server end (PHP), it does not work as well. But it is fine when sandbox testing (developmentPush.pem).
Any idea, please help and alert me what I missed out. Appreciated!