Fixing the Virtual PC SP1 "Null MAC Address" Networking Problem

In my article How to build an ISA firewall lab with Virtual PC 2004 I wrote that when you start up the ISA virtual machine you might see the following warning message:

If that’s the case, the Virtual PC configurator did not assign correctly a MAC address to the network adapters for the virtual machine. To workaround that problem you can manual assign a MAC address to the network adapters as explained in my article. However, if you like to know why this can happen and how to correct that problem, check out the Virtual PC Guy’s WebLog Virtual PC SP1 Networking problems (address “00:00:00:00:00:00” failed to initialize).


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