When a host leaves the standby mode, it may happen that the operation is extremely slow. By default, the vCenter waits 15 minutes for the operation to be completed; if, after this time, the host does not reboot, the following error appears on vCenter: Operation timed out.
- You have to change the value of timeout through the procedure suggested by VMware.
- Then try to restart vcenter service.
- If host appears in “not connected” state try to disconnect and reconnect it.
Posted in: VMware vSphere