Comment # 9 on bug 962713 from Lukas Ocilka

It seems that stopping the firewall took more than 30 seconds, the reason is
actually unknown. If we know what you were doing, we might think about, e.g.,
restarting the firewall instead of stopping and starting it. Your bugreport
does not contain any information that would tell us what you did and what you
wanted. No logs are attached.

This actually seems to be problem in firewall itself, Yast is just a handled
here. Anyway, we can't do much without more info.