I've been testing f2b over the past few days and I can now make it fail on demand. By that I mean the fail2ban-server process uses 100% of a cpu and becomes unresponsive and will not respond to fail2ban-client or process any other log entries (apache, sshd, etc.) whenever it attempts to process a dovecot log entry.
This will happen if I use the latest 1.0.1 package. However, if I use that but replace the doveconf.conf filter with the one from an earlier version (I used the one from my last fedora 35 backup) everything works fine. So, I would hazard a guess that something in the regex's in the newest dovecot.conf file is the issue. I won't pretend to even begin to understand them. They are quite complex to me.
So for now I will use the older dovecot.conf file. If someone wants me to test an updated version of dovecont.conf, I'd be glad to do that.
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