Virtual Server sometimes takes issue with Broadcom NICs. If you're experiencing any connectivity problems, and you're using a Broadcom NIC, turn off the Offload TCP Segmentation, Checksum Offload, and Large Send Offload settings for the NIC, as follows (all of these settings may not be available):
The computer will restart.
Note: When you change network adapter properties, the virtual machines attached to that adapter may loose their network connections. To restore the network connections, you must disconnect the affected virtual machines from the virtual network adapter that is attached to that physical network adapter and then reconnect them to it, as follows:
If this doesn't restore connectivity, then you'll need to restart the host computer.