I found this guide:
The solution to this problem is to disassociate the ESXi Server system from the vCenter Server system. To disassociate the host, do the following:
1. Using the vSphere Client, connect directly to the ESXi 5.0 host system.
2. In the left (inventory) panel, click the host.
3. In the right-hand panel, click Summary. From the section named Host Management at the bottom right, click Disassociate host from vCenter Server.
Note: You do not need to place the host in Maintenance Mode.
4. After you recover the virtual machine or the vCenter server is up after being down, add the host back to the vCenter server.
But on my ESXi 6.0 Host i dont have that option "Disassociate host from vCenter Server." (See attached file)
Help me please!!
I can see Disassociate host from vCenter server on my ESXi Host.
But why do you want to disassociate host?
if your vCenter is dead, you can deploy new vCenter and add ESXi Host to new vCenter.