How to reset HP ILO (Integrated Lights Out)?

How to reset HP ILO (Integrated Lights Out)?

Sometimes it happened to me that the HP ILO (Integrated Lights Out) is unresponsive. Not only the remote console but the whole web interface. In the past I used to shut down the server, unplugged it, plugged it in again and booted it. Well this is pretty uncool in...