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vSphere – Problems with licencing and MAC addresses after 5.1 ESXi host upgrade

After upgrading an ESX cluster from vSphere 5.0 to vSphere 5.1 a VM failed to reboot.. Instead, an error message was issued: Failed to start the virtual machine.  Module DevicePowerOn power on failed.  Could not set up “macAddress” for ethernet0. Invalid MAC address specified.  00:0C:29:A0:B0:1D is not an allowed static Ethernet address. It conflicts with VMware reserved […]

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