FWIW it appears that this bug is essentially a duplicate of #770171:

https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=770171

On 7/7/23 19:04, José Miguel Gonçalves wrote:

As Debian opted by systemd journal as the default logging mechanism for bookworm, maybe a better option would be to change the default configuration in '/etc/fail2ban/jail.conf' to select journal as the logging source, i.e., instead of setting 'backend = auto', set 'backend = systemd'.

That seems like a sensible suggestion to me.

Can you confirm that the current default bookworm fail2ban config/regex works with sshd with just this change (to 'backend' in /etc/fail2ban/jail.conf)? Or are further adjustments required?

Regards,
Jeremy

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