OK, just as I expected: For some reason the fail2ban process no longer identify itself as "f2b" anymore. Instead it now uses "fail2ban". I therefore need to change app-domoticz so it check if "fail2ban" is running instead of "f2b". I will try to fix this early next week.

Note: There are no "real" problem here. As long as fail2ban is running, everything is fine. It is just that app-domoticz is indicating a "false" alarm when it can not find "f2b" running...

/Fred