Today i see the iptables are :
iptables -L
Chain INPUT (policy ACCEPT)
target prot opt source destination
Chain FORWARD (policy ACCEPT)
target prot opt source destination
Chain OUTPUT (policy ACCEPT)
target prot opt source destination
and when i try to apply firewalld configurations iptables doesn’t change and the firewalld service show:
service firewalld status
● firewalld.service - firewalld - dynamic firewall daemon
Loaded: loaded (/usr/lib/systemd/system/firewalld.service; enabled; vendor preset: disabled)
Active: active (running) since Thu 2018-08-30 10:27:30 CEST; 25min ago
Docs: man:firewalld(1)
Process: 14089 ExecReload=/bin/kill -HUP $MAINPID (code=exited, status=0/SUCCESS)
Main PID: 9353 (firewalld)
Tasks: 2 (limit: 4915)
CGroup: /system.slice/firewalld.service
└─9353 /usr/bin/python3 /usr/sbin/firewalld --nofork --nopid
Aug 30 10:37:25 mirmidon-lx firewalld[9353]: ERROR: 'nftables' object has no attribute '_log_denied'
Aug 30 10:38:00 mirmidon-lx firewalld[9353]: ERROR: Failed to apply rules. A firewall reload might solve the issue if the firewall has been modified using ip*tables or ebtables.
Aug 30 10:38:00 mirmidon-lx firewalld[9353]: ERROR: 'inet firewalld raw_PREROUTING_ZONES iifname enp0s20u1 jump raw_PRE_block'
Aug 30 10:38:08 mirmidon-lx firewalld[9353]: ERROR: Failed to apply rules. A firewall reload might solve the issue if the firewall has been modified using ip*tables or ebtables.
Aug 30 10:38:08 mirmidon-lx firewalld[9353]: ERROR: '/usr/sbin/nft insert rule inet firewalld raw_PREROUTING_ZONES iifname enp0s20u1 jump raw_PRE_block' failed: Error: Could not process rule: No such file or directory
insert rule inet firewalld raw_PREROUTING_ZONES iifname enp0s20u1 jump raw_PRE_block
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Aug 30 10:42:36 mirmidon-lx firewalld[9353]: ERROR: Failed to apply rules. A firewall reload might solve the issue if the firewall has been modified using ip*tables or ebtables.
Aug 30 10:42:36 mirmidon-lx firewalld[9353]: ERROR: 'inet firewalld raw_PREROUTING_ZONES iifname enp0s20u1 jump raw_PRE_block'
Aug 30 10:45:26 mirmidon-lx firewalld[9353]: ERROR: Lockdown not possible, sender not set.
Aug 30 10:51:28 mirmidon-lx systemd[1]: Reloading firewalld - dynamic firewall daemon.
Aug 30 10:51:28 mirmidon-lx systemd[1]: Reloaded firewalld - dynamic firewall daemon.
Someone can help me, i’m nervious with going naked … 
Thank you very much