Unable to create a subscription or open Jails in Fail2Ban: f2bmng failed: ERROR:f2bmng

Symptoms

• Creation of a subscription fails with one of the following errors in Plesk GUI or in the/var/log/plesk/panel.log file:

  Error: hosting update is failed: f2bmng failed: ERROR:f2bmng:Command '['/bin/rpm', '-qf', '--queryformat', '%{NAME}n', '/etc/fail2ban/jail.conf', '/etc/fail2ban/jail.d/plesk.conf', '/etc/fail2ban/jail.local']' returned non-zero exit status 3

  ---

  ERR [panel] Domain Service Web not exists: domain=example.com, id=270

• Unable to open Jails or Banned IP Addresses menu in Fail2ban:

  Error: Unable to get the list of jails: f2bmng failed: ERROR:__main__:Command '['/bin/rpm', '-qf', '--queryformat', '%{NAME}n', '/etc/fail2ban/jail.conf', '/etc/fail2ban/jail.d/plesk.conf', '/etc/fail2ban/jail.local']' returned non-zero exit status 1.

  ---

  Error: Unable to get the list of jails: f2bmng failed: ERROR:__main__:Failed to get packages by files: package manager returned 4 lines instead of expected 3. Command was ['/usr/bin/dpkg', '-S', '/etc/fail2ban/jail.conf', '/etc/fail2ban/jail.d/plesk.conf', '/etc/fail2ban/jail.local'] and returned exit status 1. Your package system might be inconsistent. Please check it for issues with 'plesk sbin pum --check --full'..

  ---

  ERR The jail recidive was not found.

Cause

Incorrect installation of Fail2Ban.

Resolution

Perform a clean reinstallation of Fail2ban following these steps:

1. Connect to the server via SSH

2. Back up Fail2ban folder:

   # cp -a /etc/fail2ban /root/fail2ban_backup

3. Uninstall Fail2ban:

   # plesk installer --select-release-current --remove-component fail2ban

4. Move Fail2ban left-over old installation files:

   # mv /etc/fail2ban /root/fail2ban_old

5. Install Fail2ban:

   # plesk installer --select-release-current --install-component fail2ban

6. Restore Fail2ban configuration:

   # mv /root/fail2ban_backup/jail.local /etc/fail2ban/.

7. Restart Fail2Ban service:

   # systemctl restart fail2ban.service