After I upgraded from ESX 3.5 to 4.0 I also upgraded the virtual hardware from V4 to V7. That meaning the some of the virtual hardware in the vm had to be reinstalled. In Windows 2008 server it installed a new NIC called “Local Area Connection 2″ with the E1000-driver. Some services like DNS did not like that. I fixed it by adding another NIC (VMXNET3) and adding the former IP. Then I deleted the E1000-NIC.

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