I like psad. I use it often and I find the email reports really handy.

Here is an issue I faced in Ubuntu and the solution:

Instead of the reports I received an email with the following contents:

[-] You may just need to add a default logging rule to the /sbin/iptables
‘filter’ ‘INPUT’ chain on oxide-server.  For more information,
see the file “FW_HELP” in the psad sources directory or visit:

http://www.cipherdyne.org/psad/docs/fwconfig.html

[-] You may just need to add a default logging rule to the /sbin/ip6tables
‘filter’ ‘INPUT’ chain on oxide-server.  For more information,
see the file “FW_HELP” in the psad sources directory or visit:

http://www.cipherdyne.org/psad/docs/fwconfig.html

 

I found on the web several people with the same problem, so here is what worked for me:

1. Enable ufw logging. Type in console as root: ufw logging on
2. Type as root:
   iptables -A INPUT -j LOG
   iptables -A FORWARD -j LOG
   ip6tables -A INPUT -j LOG
   ip6tables -A FORWARD -j LOG
3. Open /etc/ufw/before.rules and type before the COMMIT directive:
   -A INPUT -j LOG
   -A FORWARD -j LOG
4. Open /etc/ufw/before6.rules and type before the COMMIT directive:
   -A INPUT -j LOG
   -A FORWARD -j LOG
5. Restart ufw by typing as root:
   ufw disable
   ufw enable
6. Test if it worked:
   psad –fw-analyze

I know that some parts appear to do very similar things but for a strange reason it worked only after the exact above procedure.

Hope it helps!
Vasilis

SWikipedia: S (named ess spelled ‘es’- in compound words; plural esses, forms/script: ) is the nineteenth (19th) letter in the ISO basic Latin alphabet. →