Issue of saving network rules in Kaspersky Endpoint Security Cloud
If you have an existing network rule, after you modify Firewall settings in a security profile of Kaspersky Endpoint Security Cloud, your changes may not be saved. This may happen when you select Addresses from the list instead of Subnet address in the Remote network addresses section.
Solution
To change these settings, create a new network rule. You can disable the current rule by clicking the switch in the Status section or delete it from the list of network rules.