Hello, sorry you are having this issue.
Unfortunately I am unable to reporduce this, with samba 2:4.11.6+dfsg-
0ubuntu1.6 from focal, either by applying iptables rules manually or
enabling firewall rules with ufw:
$ sudo iptables -D INPUT -i lo -j LOG
$ sudo iptables -L INPUT -n
Chain INPUT (policy ACCEPT)
target prot opt source destination
LOG all -- 0.0.0.0/0 0.0.0.0/0 LOG flags 0
level 4
$ sudo apt install samba
[ELIDED]
$ sudo iptables -L INPUT -n
Chain INPUT (policy ACCEPT)
target prot opt source destination
LOG all -- 0.0.0.0/0 0.0.0.0/0 LOG flags 0
level 4
What are you using to apply firewall rules? None of the samba packages
directly manipulate iptables in their postinstall scripts or in their
service startup files that I can see. The samba package does drop an
application file for ufw in /etc/ufw/applications.d/samba, but if ufw is
not enabled, this should not be applied, nor should the ufw trigger that
runs at the end of the installation touch iptables settings.
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https://bugs.launchpad.net/bugs/1921941
Title:
samba install flushes iptables and sets all chains to policy accept
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