Everything seems to work but no hosts are blocked? Try the following steps:
 
Everything seems to work but no hosts are blocked? Try the following steps:
 
# Run "fail2ban-regex /var/log/vsftpd.log /etc/fail2ban/filter.d/vsftpd.conf" (or equal). Do you get a "Success, the total number of match is xyz" message at the end? If not: Check if the logfile entries fits the regexpression in filter.d/vsftpd.conf  
 
# Run "fail2ban-regex /var/log/vsftpd.log /etc/fail2ban/filter.d/vsftpd.conf" (or equal). Do you get a "Success, the total number of match is xyz" message at the end? If not: Check if the logfile entries fits the regexpression in filter.d/vsftpd.conf  
Exception encountered, of type "Error"