Out of the box fail2ban sshd ban

I recently experienced problems when trying to ban brutte force attacks on the ssh server.

after much research I found out that there are still some improvements that can be implemented, especially to improve the integration with firewalld.
See a discussion here:

here is the configuration that finally worked for me, the configuration out-of-the box did not work.:

Interesting. I’m relatively new to both Firewalld and Fail2ban (after years of being spoiled by APF & BFD). Although I’ve never had a lick of trouble using them on CentOS, your trouble shooting ought to be helpful for others using Debian. Nice work and glad you got it working.