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Deny access between to networks on one interface

Hi.
We have sophos sg 310 UTM. We have internal networks 192.168.0.0/23 and 192.168.4.0/24 on one of the interface. When i try to connect wifi router which is in 192.168.4.0/24 via web interface example: https://192.168.4.2 from network 192.168.0.0/23 connection is success. We need block any connection from 192.168.0.0/23 to 192.168.4.0/24 except one ip(192.168.0.3) address. Is it possible via firewall rule? if yes, what should it look like?



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