virtualization - Permission denied for root to ESXi host

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I have an ESXi host running
a Windows 2008 R2 server VM with vCenter
installed.

Upon joining the Host to vCenter,
suddenly I could not log directly onto the host with the vSphere client using my
original root username/password.

The root
user/pass works in console just fine, but get "insufficient privileges" when I try to
use the vSphere client.

The problem being the
power went out, turning off the vCenter VM (and the rest [Active Directory]), so now I
can't connect to vCenter to start my virtual machine's again nor can I connect directly
to the host.

What are my options to at
least get the vCenter VM started again?

Answer

Are your VMs set to startup on Power on? If yes, you should be able to reboot
the physical server to bring the virtual hosts back up.

This would be found on the configuration tab
for each ESXi host in the Vsphere console under "Software> Virtual Machine
Startup/Shutdown". You'd then click on properties in the top right corner and select
"allow virtual machines to start and stop automatically with the system".

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