Hi all, just for future reference, I've arrived to this bug report trying to solve exactly this, and the comment about nftables gave me the clue.
I have a laptop with an unstable installation, and I think it's now default to install firewalld rejecting incoming connections. This is why kdeconnect was not working for me; not really the fact that ipv6 was managing the connections ; once I added an exception for kdeconnect to be able to receive incoming connections it started working properly. Adding <service name="kdeconnect"/> in /etc/firewalld/zones/public.xml fixed it for me ( actually I did it through the plasma- firewall KCM config module) Greetings all,
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