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XG - limiting traffic from one VLAN to another

My setup has 2 VLANs - Main and IoT, using Sophos XG as DHCP and gateway.  I'm able to allow traffic between the 2 VLANs by adding a firewall rule of

               LAN Any host Any service to LAN Any host Any service.  

What I'm trying to do is to only allow traffic initiated from Main -> IoT VLAN but not the other way round.  I tried 

                LAN #Port1.77 Any service to LAN #Port1.44 Any service.       (VLAN 77 is Main and 44 is IoT)

but this won't work.  No traffic is allow to flow.  

Is what I'm trying to accomplish possible with XG?



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