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Slow Communications on Server 2012 Virtual Machine

I am seeing slow communications with TOP Server running on on a virtual Microsoft Server 2012 machine. Are there any problems running TOP Server on a virtualized Server 2012?

Absolutely not, the problem here is actually an issue with running a virtualized Server 2012 - commonly seen with VMWare.

It has been found that communication speeds improve after verifying the following settings in the host machines Ethernet adapter settings:

  1. Navigate to your Device Manager, right-click on your network adapter, choose Properties.
  2. Navigate to the Advanced tab.
  3. Set the following Properties to disabled:
    • Ipv4 checksum offload
    • largesend offload V2(ipv4)
    • largesend offload V2(ipv6)
    • Vm queues
    • TCP Checksum offload (ipv4)
    • TCP checksum offload (ipv6)
    • Udp checksum offload (ipv4)
    • Udp checksum offload (ipv6)

The ECN (Explicit Congestion Notification) header could also be affecting communications please see this FAQ for instructions on disabling the ECN header.