This error would appear in the system log of the server almost everyday in the morning - HP NC373i: The network link is down . Never during the day such as late afternoon or evening. The error would occur early in the am hours juts before and at times when employees juts start reporting to work. Event id4, source l2nd.
The driver version was not updated yet. The possible solution is checking and disabling power save mode for the NIC. The server was running windows 2003 server standard edition on an HP Proliant series server hardware platform. The next step will be to update the driver version. There have been TCP offload problems with some drivers. The version installed on this server was fairy new but an update was available.