Hello @ReeXNeeX
These are some of the better articles I know of on the internet about managing access to Apple’s iCloud platform. Apple, as you will read, have very carefully crafted the iCloud platform so it is very difficult to manage restricting access to the iCloud platform both at the network edge and internally on networks.
See how you go with this extra information:
- Do search with you favorite search engine for “how to setup firewall to restrict access to icloud”
- http://www.webtorials.com/discussions/2013/01/putting-a-lid-on-apple-icloud.html
- http://searchmobilecomputing.techtarget.com/tip/How-to-restrict-iCloud-access-in-the-enterprise
- https://www.quora.com/How-can-I-block-iCloud-from-using-my-network
- https://support.apple.com/en-us/HT202944
Happy to Help,
Marcus 