How to get the MOR when directly connectet to the host?

Hi,

I am trying to reboot a host with the rebootHost_Task (MOR _this, boolean force). Therefor I need a MOR of he host.

But how do I get this, if I am directly connectet and not via vCenter?

I tried:

ManagedObjectReference mor = si.getServerConnection().getServiceInstance().getMOR();

si.getServerConnection().getVimService().rebootHost_Task(mor, true);

But this throws an error:

The request refers to an unexpected or unknown type.

Any help would be appreciated.

Chris