Unable to change IP address type: f2bmng failed: ERROR NOK: ('plesk-wordpress',)

Symptoms

• Change of the IP address type via the tab Tools & Settings > IP Addresses > 203.0.113.2 fails:

  PLESK_ERROR: f2bmng failed: ERROR NOK: ('plesk-wordpress',)
  Traceback (most recent call last)

• Fail2Ban is disabled in Tools & Settings > IP Address Banning (Fail2Ban) > Settings > Enable intrusion detection .

• Fail2Ban is constantly in the activating state:

  # systemctl status fail2ban.service
  ● fail2ban.service - Fail2Ban Service
  Loaded: loaded (/lib/systemd/system/fail2ban.service; enabled; vendor preset: enabled)
  Active: activating (start) since Jan 1970-01-08 12:31:16 EST; 46s ago
  Docs: man:fail2ban(1)
  Process: 34715 ExecStartPre=/bin/mkdir -p -m 755 /var/run/fail2ban (code=exited, status=0/SUCCESS)

Cause

Fail2Ban service is stuck.

Resolution

1. Connect to the server using SSH .
2. Stop and disable Fail2Ban service:
   

   # systemctl stop fail2ban.service
   # systemctl disable fail2ban.service