The HostID is what we use to identify your CensorNet. Your license is tied to it. It is normally formed from the MAC address of the first NIC that Linux detects. On VMWare systems, it is formed by some calculation that that software makes and normally contains a _V at the end. Make sure you tell us the HostID as shown on the CensorNet's web interface, as this is the code it will expect the license to be keyed to.