Reinstall shorewall:
apt-get install --reinstall shorewall
WARNING: Cannot set Martian logging on eth1 Preparing iptables-restore input... Running /sbin/iptables-restore ... iptables-restore v1.8.2 (nf_tables): line 4: TABLE_FLUSH failed (Device or resource busy): table raw ERROR: iptables-restore Failed. Input is in /var/lib/shorewall/.iptables-restore-input logger: socket /dev/log: Connection refused Preparing iptables-restore input... Running /sbin/iptables-restore... iptables-restore v1.8.2 (nf_tables): line 4: TABLE_FLUSH failed (Device or resource busy): table raw ERROR: /sbin/iptables-restore Failed. logger: socket /dev/log: Connection refused
Reboot of server fixed above.
You can get this error on reload or restart. Try deleting the .start, .restart or .reload files in /var/lib/shorewall/. They will get regenerated on next shorewall start or shorewall restart
If you are adding rules to /etc/shorewall/rules file via embedded shell command i.e.
?SECTION NEW SHELL cat /etc/shorewall/rules.d/*.rules 2> /dev/null || true
and the changes are not applied make sure that AUTOMAKE=No in /etc/shorewall/shorewall.conf. Check the man page for other possible values.