Cannot open IP Address Banning (Fail2Ban) in Plesk panel: No section

Vincent Lauton

Updated April 21, 2025 21:42

Plesk for Linux kb: technical ext: fail2ban

Symptoms

When going to Tools & Setting > IP Address Banning (Fail2Ban) the following error messages are displayed:

ERROR No section: 'Definition'

f2bmng failed: ERROR:__main__:No section: 'plesk-one-week-ban'

Corrupted Fail2Ban installation

Connect to the server via SSH
Remove the fail2ban-related packages (example below is for Ubuntu/Debian):

# dpkg -P --force-depends fail2ban

# dpkg -P --force-depends plesk-fail2ban-configurator
Rename/back up leftover directories /etc/fail2ban and /var/lib/fail2ban:

# mv /etc/fail2ban /etc/fail2ban.back

# mv /var/lib/fail2ban /var/lib/fail2ban.back
Reinstall Fail2Ban via Plesk Installer