Configure the DMZ port on a Sonicwall TZ190 for LAN access

I need to allow access from the DMZ port on a TZ190 to a specific host on the private LAN port. I only need 4 TCP ports open. I can ping from LAN side to the serveron the DMZ but not the other way despite my access rules.  This can be done, right, or is the DMZ by design not allowed to get to the LAN side?
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By design, the DMZ port is isolated from the other ports in the network. Otherwise, your DMZ computer becomes a vulnerability to the rest of the LAN computers in the network.

As long as you understand the risks, you need to set the DMZ port to operate in Transparent Mode and map:

I would simply "forward" the ports to the desired LAN IP address and keep the system out of the DMZ (especially if you are only utilizing 4 TCP ports!) Definitly set the IP to static or "reserved" via DHCP.  
Cas KristCommented:
You need to create a firewall rule "DMZ->LAN" which allows your traffic.
Create a group of your services which need to travel from DMZ to LAN, then create a rule.
In this picture I have an example of a webserver in the DMZ which needs to acces a MS-SQL server in the LAN.
kesslerkareAuthor Commented:
I had already created a DMZ->LAN rule but that was not all I needed. As it turned out, I had to also create a NAT policy for the DMZ to LAN which I still think is crazy but that resolved it. So CASKRIST was paritally correct and thank you for your response.  I find the Sonicwall to be a good product but configuring it is not intuitive at all.

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Cas KristCommented:
Very strange, I have this setup in use for quite some time, I don't have a NAT policy for this. Could you show us the NAT policy you had to create?!
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