The ESET Security Management Center (ESMC) Mobile Device Management (MDM) component uses the APNs communication protocol for the management of iOS devices. All ESMC MDM components older than version 184.108.40.206 rely on the old binary API part of the APNs protocol. In November 2020, when the binary API part of the APNs protocol is deprecated, users with an MDM component on a version older than version 220.127.116.11 will lose the ability to manage iOS devices.
Prior to the November 2020 deadline, upgrade the ESMC MDM component to version 18.104.22.168. If required, execute the certificate exchange process.
If the ESMC MDM component is upgraded after the November 2020 deadline the managed iOS devices should restore the connectivity and functionality when the upgrade process is finished.
Yes. You can still use the self-signed certificate signed by ESMC CA after the November 2020 deadline. However, there is a potential loss of connectivity if the HTTPS certificate exchange is executed without the MDM upgraded to version 22.214.171.124.
If the user has self-signed the HTTPS certificate and executes the HTTPS certificate exchange before upgrading the ESMC MDM component to version 126.96.36.199 after the November 2020 deadline, iOS devices can lose connectivity. This occurs because the iOS device is unable to exchange trust with the MDM component due to the MDM component's inability to notify the iOS device via the old APNs protocol.
Managed devices will automatically reconnect to the MDM component when the ESMC MDM upgrade to version 188.8.131.52 is complete.