fail2ban is no working

[mentes]

I think is not working, this is the whole log:

root@main:~# cat /var/log/fail2ban.log 
2011-08-05 20:56:20,180 fail2ban.server : INFO   Changed logging target to /var/log/fail2ban.log for Fail2ban v0.8.4-SVN
2011-08-05 20:56:20,181 fail2ban.jail   : INFO   Creating new jail 'ssh'
2011-08-05 20:56:20,181 fail2ban.jail   : INFO   Jail 'ssh' uses poller
2011-08-05 20:56:20,231 fail2ban.filter : INFO   Added logfile = /var/log/auth.log
2011-08-05 20:56:20,231 fail2ban.filter : INFO   Set maxRetry = 6
2011-08-05 20:56:20,232 fail2ban.filter : INFO   Set findtime = 600
2011-08-05 20:56:20,233 fail2ban.actions: INFO   Set banTime = 600
2011-08-05 20:56:20,312 fail2ban.jail   : INFO   Jail 'ssh' started
2011-08-05 21:01:04,889 fail2ban.jail   : INFO   Jail 'ssh' stopped
2011-08-05 21:01:04,889 fail2ban.server : INFO   Exiting Fail2ban

root@main:~# /etc/init.d/fail2ban restart
Restarting authentication failure monitor: fail2ban failed!

root@main:~# /etc/init.d/fail2ban stop
root@main:~# /etc/init.d/fail2ban start
root@main:~#