I tried to activate
https://wiki.univention.de/index.php/Cool_Solution_-_Account_lockout
Sadly, I’m locked out on the Administrator account and on a differente account now. I disabled the parameters again, but still no luck.
I tried faillog -r -u Administrator
nothing changed.
Via ssh and the root account I tried to change the password using passwd, but there I have to enter the ‘current kerberos password’, which seems to become invalid. So I have no idea how to reset the Administrator password or activate it again.