This message was posted on behalf of Intel Corporation
Thank you for the post. Just to double check are you connecting this PT server adapter to a switch? Please make sure the switch port is configured as gigabit mode. If the switch is set to autnego mode, you can set the PT server adapter to autonego as well. Both sides be it on the switch or the network adapter should have the same setting.
You can also try to change a cable to isolate if it is cabling issue. Make sure to use the latest driver.