While testing a vCenter Heartbeat (vCHB) installation, I cloned the Windows VM used for vCenter Server, but did not use guest customization as the vCHB directions stated not to. Since guest customization was not selected, sysprep was not run on the new Windows system.
Once the clone was complete, I followed the directions and disconnected the vNICs. Next, I powered the system up and changed the IPs. Finally, I reconnected the vNICs. I tried a ping to an outside address and to an IP configured on the VM and received:
PING: transmit failed, error code 1232.