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slow network speeds on new server.

I have been working on an issue with slow network speed with a server for a week without any success. However I dont think it is a network issue and now believe it to be a hardware issue.

On the server I have been using iperf to test to itself. I am getting results of around 45Mbits/sec. Now this is just testing from the server to itself, so it is not touching the network. After working on this for a week I reinstalled Windows thinking that it was the issue. Right after a clean install I am getting the same exact issue. Also I installed a new network card in it half a week ago, going from broadcom to intel NIC.

Any ideas on what could be causing this? Now I am thinking that it is a hardware issue of some kind? Have no idea what.
3 Solutions
have you look at the Network Switch or router that the server is plugged into? Even the network cable?

Good Luck.
ryan80Author Commented:
it is not related to the network at all. I am using iperf for testing speeds and running it to localhost. There is no network traffic going on, it is all internal to the machine.
Darius GhassemCommented:
Most likely a TCP Offload is causing the problem.


Go to properties of the network card then disable any Offloads listed.

Reboot server.

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Darius GhassemCommented:
Remove any Antivirus software as well for testing
What are you using for antivirus on the server?
I would uninstall Norton and McAfee as they are resource hogs.
Kelly W.
ryan80Author Commented:
as an update i opened a case with Microsoft. It has been 3 days now, and they have no clue what it is.
ryan80Author Commented:
it is not related to a network issue. it is some kind of tcp stack or kernel issue.
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