Zenmap shows me that port 1716/tcp is open and
sudo fuser -v 1716/tcp tells me kdeconnectd is responsible for it.
Why does kdeconnectd have the 1716 port opened all the time? And what would be best practice from a security standpoint for it? I'd like to use KDE Connect but not be vulnerable to any kind of attack that could exploit this open port.
Would that be having it closed except when I want to explicitly use KDE Connect maybe? If that would be a good thing to do: how can I do that?
I'm running Debian 9.1 with KDE and am still new to GNU/Linux.
Edit: based on schweik's answer a current way seems to be running
sudo chmod -x /usr/lib/x86_64-linux-gnu/libexec/kdeconnectd && pkill kdeconnectd (after running KDE Connect) and
sudo chmod +x /usr/lib/x86_64-linux-gnu/libexec/kdeconnectd before running KDE Connect. It has to be run again after updating the package and one might also move the file. Check with
sudo lsof -i.