Dynatrace ActiveGate allows you to specify custom communication ports. This means that you can configure ActiveGate to listen for traffic from OneAgent on ports other than the default ports. To do this, adjust the settings in the custom.properties and launcheruserconfig.conf files located in the ActiveGate configuration directory. If you are changing ports in the Dynatrace Managed cluster itself, it is best that you contact support. I don't know if this is even possible.