ban hosts that cause multiple authentication errors

Version included in wheezy repository (0.8.6) has serious issues with timezones and other bugs, so you would like to use last version from git repository

1. clone repository

   git clone https://github.com/fail2ban/fail2ban.git

2. change directory and install the app

   cd fail2ban
   python setup.py install

3. copy config files

   cp config/* /etc/fail2ban/

4. print iptables version

   iptables --version

5. if iptables version <1.4.20 edit the /etc/fail2ban/action.d/iptables-common.conf and set locking opt to empty string:

   lockingopt =

6. create startup script and start the service

   cp files/debian-initd /etc/init.d/fail2ban
   update-rc.d fail2ban defaults
   service fail2ban start

• NOTE: installation script registers the app to python package system so uninstall (in case you want to switch back to distribution package) is as easy as

  pip uninstall fail2ban

  DELETE FROM bans WHERE DATE(timeofban, 'unixepoch') < '2020-01-01'; VACUUM;

change default context in /etc/fail2ban/filter.d/asterisk in following line

^(%(__prefix_line)s|\[\]\s*)%(log_prefix)s Call from '[^']*' \(<HOST>:\d+\) to extension '\d+' rejected because extension not found in context 'default'\.$