KB11: exit from standby mode: Operation timed out

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.



  1. You have to change the value of timeout through the procedure suggested by VMware.
  2. Then try to restart vcenter service.
  3. If host appears in “not connected” state try to disconnect and reconnect it.


Posted in: VMware vSphere