I think there is a problem with fail2ban on Debian 12 @VirtuBox

The fail2ban.sock and /var/run/fail2ban folder doesn't exist

remove and re-install fail2ban stack doesn't resolve the problem

    a month later

    I got similar issue fail2ban does not work...

    25 days later

    edit file /etc/fail2ban/jail.d/defaults-debian.conf

    add this line

    backend = systemd

    i use my jail for example ssh

    [sshd]
    enabled = true
    filter = sshd
    maxretry = 3
    bantime = 1080023
    findtime = 600
    backend=systemd
    #logpath = /var/log/nginx/access.log
    port = 22

      23 days later

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