I think the issue is caused by this line: journalmatch = _SYSTEMD_UNIT=postfix.service
in this file: /etc/fail2ban/filter.d/postfix.conf this was changed in fail2ban version 1.1.0 to: journalmatch = _SYSTEMD_UNIT=postfix.service _SYSTEMD_UNIT=postfix@-.service root cause of that issue: Fail2Ban is with the old entry not able to read postfix logfiles. Overwrite your postfix.conf file with the lastest version from github: https://github.com/fail2ban/fail2ban/blob/master/config/filter.d/postfix.conf Will fix this issue Details about this bug can be found here: https://github.com/fail2ban/fail2ban/pull/3692 -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/2085663 Title: fail2ban postfix filters do not work in 24.04.1 LTS To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/fail2ban/+bug/2085663/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
