[CentOS] systemctl reboot -- server not accessible after reboot

[Mike]

It turns out kdump.service is already enabled on the server and
/etc/kdump.conf settings would report any kernel crash/error items to
/var/crash.
The /var/crash file/folder is empty.
It leads me to think the kernel is not crashing; however, I could be wrong.
I'll need to perform another test "systemctl reboot" from remote ssh
session and check it one more time.