To forcibly disable push notifications, you revoke the connection’s encryption certificate. After you revoke the certificate, your server can no longer send push notifications.
If the private key portion of your certificate is compromised, revoke the certificate. A compromised certificate can’t ensure authenticity, integrity, or privacy of push notifications. This means users can’t trust that push notifications came from your server, weren’t tampered with in transit, and haven’t been seen surreptitiously.
The private key is a file and can be compromised by theft of the server, the disk it’s stored on, or its backup media. The private key can also be compromised by anyone who has access to your server.
Log in to the Apple Push Certificates Portal.
Sign in with the Apple ID you used to request the certificate.
In the OS X Server Certificates section, locate the certificate for the desired server.
Click Revoke in the Actions column, then confirm the action.
When you finish, sign out.