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TZ250 DMZ Setup Issues

I have a TZ250 running and am having trouble setting up a DMZ.

(I have changed the first 3 fields, the network portion of actual IP addresses for privacy reasons. The 4th field (host) is exactly as provided by the ISP, COX Communications)

I want to set up a DMZ for multiple addresses that aren’t NAT’d. They’re for individual VM’s on a Windows Server 2019 running Server 2019 Datacenter Version and each VM has a dedicated physical NIC. These NIC’s will connect to the DMZ Port via a dedicated switch or VLAN.

Before needing to set up multiple static IP’s, the site had 1 Static IP –

Static IP     

S/N Mask 


I requested a change to 5 static IP’s and expected to receive a block of 8 with 5 usable, Instead I received the following:

Static IP’s


Subnet mask

NETBLOCK which translates to a range of –

The WAN Zone Parameters are,, (DNS’s are immaterial)

I set up a DMZ using the Portshield Wizard to set up a WAN/OPT/LAN and changed the Unassigned Port to a DMZ.

I’ve had no luck in configuring the Port. I ‘ve tried a variety of configuration parameters.

When I change the Zone from Unassigned to DMZ the screen is populated with Static IP Mode, IP Address, S/N Mask, Gateway

I have tried, 255.255.255,192,,,

And each of the other assigned Static IP’s

Each time when I click OK the setting reverts to Unassigned,, 0,0,0,0, N/A

What am I missing?

Thanks in advance for any help.

Category: Entry Level Firewalls

Best Answers


  • Options
    MSYFlyerMSYFlyer Newbie ✭

    Thanks SARAVANAN, as you can see I found he Transparency solution and implemented it a few minutes before your post.

    Your answer is spot on and appeciated.

  • Options

    You are welcome @MSYFLYER. Sorry, I didn't see it as I was collecting the info and drafting it for you. Thank you so much. Appreciate your efforts.


    Saravanan V

    Technical Support Advisor - Premier Services

    Professional Services

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