The Server loses all external network connectivity.
No new or unusual errors present in the EventViewer logs.
The computer remains accessible through the KVM (Keyboard Video Mouse), normal user interface.
I can ping 127.0.0.1
I cannot ping beyond that, not even to the switch.
Changing ports on the switch does not help.
The remedy has always only been to reboot.
The NIC settings are such that power management is unchecked.
Dell replaced the MB which contains the NICs,, but that did not help.
I added an intel NIC, but that didn't help.
This is SBS 2011.
It happens once or twice a month, or once or twice a week, sometimes each day of the week and it happens any time of the day or night.
It is on a PowerEdge R320.
Do you have any ideas of what is happening?