Fixing network connectivity issues with Broadcom NICs

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):

  1. In the Network Connections control panel, right-click the connection and click "Properties."
  2. Click "Configure."
  3. In the Property list on the Advanced tab, select "Offload TCP Segmentation."
  4. In the Value box, select "Off."
  5. In the Property list, select "Checksum Offload."
  6. In the Value box, select "Off."
  7. In the Property list, select "Large Send Offload."
  8. In the Value box, select "Off," and then click "OK."

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:

  1. From the Virtual Server Administration Website, shut down or turn off the virtual machine.
  2. On the virtual machine configuration page, click "Network adapters."
  3. In the "Connected to" box, select "Not connected," and then click "OK."
  4. In the "Connected to" box, select the virtual network adapter, and then click "OK."

If this doesn't restore connectivity, then you'll need to restart the host computer.

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