UFW with Kernel 4.9.40 doesn't work

[Gytis]

Problem is that after reboot ufw does not persist as enabled.

Anyway I’ve found the problem - Kernel doesn’t support logging - see ufw’s bug tracker:

I have the very same issue on a Banana Pi with kernel 3.19; the reason is that the kernel has no support for LOG but only for NFLOG. To work around this use ‘ufw logging off && ufw enable’.
It would be great to get NFLOG support. Changeing LOG to NFLOG and --log-prefix to --nflog-prefix should suffice. Adding runtime detection would be great!

Expecting Kahda’s Kernel 4.9 might have the same problem I have disabled logging:

sudo ufw logging off

And also because I have disabled IPv6, I needed to disable IPv6 in ufw config too:

sudo nano /etc/default/ufw

And set:

IPV6=no

Now enabling ufw gives no error:

khadas@gytis-vim1:~$ sudo ufw enable
Command may disrupt existing ssh connections. Proceed with operation (y|n)? y
Firewall is active and enabled on system startup

And persists after reboot:

khadas@gytis-vim1:~$ sudo ufw status
[sudo] password for khadas: 
Status: active

Downside is having no ufw logs. If anyone who has experience with Kernel modules could check what’s missing, would be great