Multiple client ldap config not working when one DC is not responding

Hi, my first post here. I’ve inherited this from someone who used to work at the company several year ago. The issue I’m seeing is that the system has been setup for multiple costumers to use TOTP tokens for Citrix logon. All customers are setup withs windowsldap realms.
When one customers domain controller is not responding for some reason the whole system goes down.

Any help would be appreciated.

Information to look at:

  1. Resolver config
  2. Realm config
  3. Log file