The problems seems to be apparmor, which is restricting permissions.
Problem can be solved by changing the file /etc/apparmor.d/usr.sbin.fwknopd and add the following lines:
/run/xtables.lock rwk, network inet dgram, network inet6 dgram,
The problems seems to be apparmor, which is restricting permissions.
Problem can be solved by changing the file /etc/apparmor. d/usr.sbin. fwknopd and add the following lines:
/run/xtables.lock rwk,
network inet dgram,
network inet6 dgram,