I haven't been able to figure out why, but after a day or two fail2ban stops banning new entries. It seems to lock up. I have to shutdown fail2ban (doesn't send emails saying jails are stoping) and start it again.
Is this a known problem or is there anything i could do to figure out whats causing it?
I cannot be sure but the following line sometimes occurs when it seems to stop working:
2007-05-17 08:25:50,869 fail2ban.comm : WARNING Invalid command: ['add', 'VSFTPD', 'auto']