It could be a sqlite3 issue there is a open bug tracker ticket for it. I
could be putting the jump rule in the wrong place in the iptables rule
set.
which is most likely.  Both a fairly easy to fix, check you log files
for a sqlite3 failure.

 
On Tue, 2015-09-29 at 09:00 -0300, Christian Schmitz wrote:

> Hi everyone:
> I need know why fail2ban is not banning IP. The Fail2ban is runing, the jail 
> active, and detect it:
> I receive the email:
>       Hi,
>       The IP 120.146.197.161 has just been banned by Fail2Ban after
>       3 attempts against sasl.
>       ...........
> But even if "fail2ban-client status sasl-iptables" report the IP as blocked
> sasli see the hacking try persist onto the mail logs:
> 
> postfix/smtpd[3676]: lost connection after AUTH from 
>       CPE-120-146-197-161.static.vic.bigpond.net.au[120.146.197.161]
> schweb postfix/smtpd[3676]: disconnect from
>        CPE-120-146-197-161.static.vic.bigpond.net.au[120.146.197.161]
> 
> If i look on fail2ban.log:
> 2015-09-27 01:26:16,167 fail2ban.actions[9478]: WARNING [sasl-iptables] Ban 
> 120.146.197.161
> 2015-09-27 01:26:16,187 fail2ban.actions.action[9478]: ERROR   iptables -n -L 
> INPUT | grep -q 'fail2ban-sasl[ \t]' returned 100
> 2015-09-27 01:26:16,188 fail2ban.actions.action[9478]: ERROR   Invariant 
> check 
> failed. Trying to restore a sane environment
> 2015-09-27 01:26:16,207 fail2ban.actions.action[9478]: ERROR   iptables -D 
> INPUT -p all -j fail2ban-sasl
> iptables -F fail2ban-sasl
> iptables -X fail2ban-sasl returned 100
> 
> 
> How i can solve it?
> 
> Best Regards
> Christian Schmitz


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