Users can't change password via web interface

Hello,

we have a problem were users are unable to change their password through the web interface. They are able to login, but after providing the old and new password for the change they get an error message.

Screenshot 2024-10-22 145822

The log file /var/log/univention/management-console-server.log tells me:
22.10.24 14:27:44.707 AUTH ( WARN ) : Changing password failed (('Authentication token manipulation error', 20)). Prompts: [('Current Kerberos password: ', 1), ('New password: ', 1), ('Retype new password: ', 1), ('Unable to reach any changepw server in realm DOMAIN.LOCAL', 3)]

Has anyone a hint or two?

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