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this is the official doc (not sure if you have already tried this) https://docs.k3s.io/installation/requirements?_highlight=ufw&os=suse#operating-systems then you can get creative with

--add-source

options to further restrict things

The firewall rules mentioned seem to be related to traffic in-between pods, I'm just trying to bring the first node online and traffic is failing to be sourced properly when destined for 127.0.0.1:6443 😕