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Resolved Plesk Firewall [Do I have to open all ports when switching from another firewall to Plesk Firewall?]

With the Plesk firewall, you can block a bunch of countries using the ISO 3166 country codes , all ports (incoming) and place the deny rule at the top.

This way, you will block incoming traffic for the websites and email.
I have:

Plesk Obsidian
Versión 18.0.44
Debian 9.12

And firewall doesn’t allow to put ISO 3166 country codes for doing blockings. Just port ranges or nets.

Another workaround?
Thanks
 

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Also update the extension. In the latest Plesk the Plesk Firewall is not a component, it is an extension, and you'll need the latest version of it.
 
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