Which software firewall is deployed in MiaB

I have found this statement in setup guide:

Firewall settings
If your machine is behind a hardware firewall (or virtual equivalent, such as an AWS security group), ensure that the following ports are open: 22 (SSH), 25 (SMTP), 53 (DNS; must be open for both tcp & udp), 80 (HTTP), 443 (HTTPS), 465 (SMTP submission), 993 (IMAP), 995 (POP) and 4190 (Sieve). It doesn’t hurt to block other ports, but your box will take care of that itself by configuring a software firewall on the machine itself.

Which software firewall is configured on MiaB?

They are using the Uncomplicated Firewall (UFW).


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Well, if this is correct, I wonder why package ufw is not installed.


UFW is not installed by default but that would be the default S/W firewall - its a front end to netfilter iptables which by default is set to allow all traffic in and out without restriction.

Hope it helps

I installed ufw and can now maintain firewall rules.

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