Push notification - Caused by: java.io.IOException: toDerInputStream rejects tag type 45

Question

I got this error when my server try to push a notification to a specific device based on device token and ck.pem (combination between .pem file, cert and key).

Answer 1

I just found the answer. When I try to generate a P12 key, I need to select both, a private key and certificate in keychain access.