This is my experience using tableau server on a virtual machine. Everytime we restart the license gets deactivated. Tableau support to change mac address and VM ip address to be static. We did that and the licensing problem continued to exist but this time it was because the tableau licensing service (tablicsvr) appeared stopped whenever the server got restarted. I found that this was because it was on Delayed Autostart rather than the normal Autostart. This fixed the problem finally. Each time a VM restarts its mac address can get changed , and when it does the licencing stops working as it relies on a fixed config for the VM. A bit of a hassle but we overcame it finally.