Intel considers this a mature product therefore the support we offer is only through our web site but as an additional detail you can try the following recommendations:
1. Make sure you have the latest drivers from our website.
2. Check for any conflicts or exclamation marks in device manager.
3.You can test with a "peer to peer" connection or ping the network.
Thank you, for your anwser, but i have the latest driver from the producer's website (02.02.2012. version: 126.96.36.199)
There is no exclamation marks in the device manager, not even between the covered ones.
When the server is on, it react to the ping order, but when it is off, the orange LED of the LAN port lights, the green one flares up