Apple has announced that it will be removing support for SSL 3.0 on its Push Notifications from the 29th of October, and they will be switching to TTSL.
Developers who are using SSL 3.0 will need to change over to TTSL, although developers who are using both SSL 3.0 and TTSL will not need to make any changes.
In order to protect our users against a recently discovered security issue with SSL version 3.0 the Apple Push Notification server will remove support for SSL 3.0 on Wednesday, October 29. Providers using only SSL 3.0 will need to support TLS as soon as possible to ensure the Apple Push Notification service continues to perform as expected. Providers that support both TLS and SSL 3.0 will not be affected and require no changes.
To check for compatibility, we have already disabled SSL 3.0 on the Provider Communication interface in the development environment only. Developers can immediately test in this development environment to make sure push notifications can be sent to applications.
Any servers which have not been updated by Apple’s deadline of the 29th of October will no longer be able to send push notifications.
Source 9 to 5 Mac