An iOS MDM Server is located on the internal network of an organization. Port 443 (default port) must be enabled for external access, for example, by publishing the iOS MDM web service on corporate firewall that supports Kerberos constrained delegation.
Any standard configuration requires access to Apple web services for the iOS MDM Server (range 17.0.0.0/8) through TCP port 2197. This port is used for notifying devices of new commands by means of a dedicated service named APNs.
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