Yes that did it… Thanks for the help…
For anyone who is interested:
-
Locate your Roundcube error log. It is in the /roundcube/logs/ folder. In my case:
/home/myserver/public_html/roundcube/logs/errors.log -
Add this path to: filter action jails > roundcube-auth > log file paths
Replace whats there with your path to the log from above. -
Enable, save and restart the f2b server.
You will now see it in the system > system logs > f2b.log :
2022-02-23 12:38:09,110 fail2ban.filter [500]: INFO [roundcube-auth] Found xxx.xxx.xxx.xxx - 2022-02-23 12:38:09