SSL operation failed with code, while sending push notification to ios devices

I am trying to send push notifications, to iOS Devices which was working pretty well, but suddenly it started throwing the following error:

stream_socket_client(): SSL operation failed with code 1. OpenSSL Error messages: error:14094438:SSL routines:ssl3_read_bytes:tlsv1 alert internal error

I checked with server port 2195 and 2916 both are enabled and double checked the .pem file which seems correct too.

I would appreciate if I can get help on the above error.

Thanks

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