UMP: certificate_expired error in portal.log

Document ID : KB000119906
Last Modified Date : 05/11/2018
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 After upgrading  the wasp to the latest version via the Vulnerability patch for 8.51 (upgrading to 8.53) the customer is seeing a lot of unexplained error messages in the portal.log:
ERROR [POST2APNS:76] Exception sending post: com.notnoop.exceptions.NetworkIOException: Received fatal alert: certificate_expired Received fatal alert: certificate_expired 
UIM 8.53 and up (confirmed in  UIM 9.02)
This is caused by the UIM Mobile App when installed on iOS, the error is caused by the Apple Push notifications.
There is currently no way to remove these messages, but none of the functions of the mobile app or UMP appear to be impacted and work fine.