You mind-reader... I almost made this wisecrack earlier... But decided against it. 
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Yes, both GUFW and UFW come pre-installed in Zorin OS. If they aren't installed on your system perhaps you may have accidentally uninstalled them or there may have been an upgrade issue if you are still using the original Beta install of Zorin OS 16
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I apologize. I needed to be sure.
Yes, I am still using Zorin OS 16 Beta.
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OK, found it. Thanks Kyrill.
I did a search, thought it would of come up when I typed Firewall.
I also had already installed using the info from Aravi...
All Good, nothing to see here...!!!
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I am glad the devs have pointed out where GUFW (Firewall) setting is now located. I would have taken some time to find it otherwise. Note, as in previous ZorinOS installs, GUFW is set OFF by default. Definitely one of the early settings to change.
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One of the reasons why we often must point out that Zorin OS is not "re-skinned Ubuntu."
While most searches under Ubuntu should still get to a solution; there are still a lot of Zorin Specific goings-on that must be addressed here on this forum.
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How do I add a wine app to the firewall list?
Update. To easily find the Firewall Configuration. Just learned if you click the 'Activities Button' (the 2 squares right next to Z, start menu, bottom left and type firewall in the search box) you will get this..
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Marked solution. 30
anyone know how to block wine apps from accessing the internet? im still on zorin os lite
Off the top of my head: You could use Iptables or a firewall rule... Would need to look up a detailed guide, really, to make further suggestions. But first, I would suggest caution.
It may seem look a good move at the outset, but haunt you later.
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To activate your firewall via the terminal
Use this code
type or paste code here
sudo ufw enableIf you launch GUFW, click on Rules tab, then click on Add you will get some preconfigured Firewall Rules. The only ones specific for WINE are:
WINE: Starcraft
WINE: Warcraft III
WINE: Warcraft III all ports