Some software still ties license keys to MAC addresses. VMWare, by default, only allows a virtual machine to use a MAC address in their assigned range. So what do you do when you virtualize a system and use the old MAC address? You get a “XX:XX:XX:XX:XX:XX is not an allowed static Ethernet address” error message when you try to boot the VM.
To resolve this add the following line to the VMX file for that VM:
ethernet0.checkMACAddress = “FALSE”
This will disable the MAC checking when powering on the VM.