It disabled shorewall (which was my goal ), but it also removed nethserver-firewall-base. The network became unstable. Shares not accessible, docker containers unable to communicate.
I was lucky to find this forum post. The firewall application delete command in cockpit may need some attention.
YUM logfile:
Jan 02 20:25:03 Erased: nethserver-firewall-base-ui-3.13.1-1.ns7.noarch
Jan 02 20:25:03 Erased: nethserver-firewall-base-3.13.1-1.ns7.noarch
Jan 02 21:18:58 Installed: nethserver-firewall-base-3.13.1-1.ns7.noarch
Nethserver V7.9.2009, server only (no use of red interfaces (what used to be gateway mode ).
This is a bug but the fix is quite tricky, we will need time to find a good solution.
As @stephdl said, yum is not always simple to manage, still the UI should have warned you:
Please don’t, you’re going to break your installation in so many horrible ways