How do I know what Windows Domain Controller is RHEL7.4 is using?

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We have a Windows integration for RHEL7.4 environment.

When Windows Administrator turns off the old domain controller, the Linux users cannot SSH to the RHEL7.4 Linux server which is using new domain controller.

  1. The /etc/krb5.conf file, "realm list" command is showing the new realm name .

  2. /etc/resolv.conf shows new domain controller's IP.

  3. I searched the old domain controller's name in /etc. I could only find the name in /etc/krb5.conf.1 (maybe a backup file someone created).

But Windows Admin thinks that something in the Linux server still making use of the old domain controller somehow. How do I prove the RHEL7.4 is making use of the new domain controller and not the old one?

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