Login problems - Ubuntu client in the domain


I have identified a problem and still have no solution.
But maybe someone has the same problem.

I use the ubuntu laptops and computers in versions 19.10 and 20.04, the clients are integrated into my domain.
(I set it up with the following HowTo)

I have now changed my password in the cockpit, but it has been accepted, but the clients do not synchronize.
With a laptop I can log in with the new password, on two other computers only with the old password.

Who knows the problem, how can I reconcile the passwords?


Does a ping from the computers to the AD domain work?

Is fail2ban active for internal LAN?

Did you already try to rejoin the domain?