The ESXi host is pingable but VI Client is not able to login. I went to the host's Management Console and the screen is completely blank.
However, I am able to login thru SSH and have restarted the management service (/sbin/services.sh restart). But The console remain blank.
I also manage to list all the VMs (esxcli vms vm list) and hope to shutdown all the VMs (instead of power off the VMs which will risk losing data) before I reboot the host. esxcli vms vm kill is power off the VMs right? Is there a command to shutdown the VMs instead?