Aris Business Designer 7.2 login issues

Hi all, i am totally new to Aris Business Designer 7.2 and I hope that i ask my question in the right forum.

This week two Windows domain controllers are switched off. Those 2 DC's were used for user authentication by LDAP.

Now the users cannot login to Aris. Is there a simple trick to change the old dc's to 2 new dc's?

Thanks for your reply.

Regards

!!!UPDATE!!! fixed by add the old dc names in dns with the ip's of the new domain controllers.