VCF 9.x
SDDC 9.x
vCenter 9.x
Stale ESX host is showing in vCenter as Disconnected / Not Responding.
Remove the stale ESX host from the vCenter inventory.
Re-sync Inventory:
VCF Operations > Inventory > VCF Instances > VCF domain > Actions > Sync Inventory
Out-of-band changes in VCF 9.0 can also cause Sync Inventory from VCF operation fails - Import operation for sync with id ###-###-###-### failed internally.
Note, When users remove the dead hosts directly from vCenter instead of using VCF remove domain workflows, issues may arise later down the road when attempting to remove the host from VCF.