Prevent WAN access on additional IP address.

To map a public address to an internal address in the UTM-9, my understanding is that under "Interfaces" > "Additional Addresses" > I add a new address and assign it to the Outside interface.

Then create a NAT that for instance maps ANY service coming from ANY source going to this Additional address gets translated to the internal address that I choose.

My problem is that now I can manage the firewall using the additional address.
For instance, if the WAN address of the UTM is 65.65.65.60 and the additional address is 65.65.65.70, I can now managed the UTM using:

https://65.65.65.60:4444/ and https://65.65.65.70:4444/


How do I prevent https://65.65.65.70:4444/ form working.

I tried firewall rules such as, traffic from ANY using service 4444,80,443 going to 65.65.65.70, drop or reject. But it doesn't change anything.

Any help would be appreciated.

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