Do you have the same issue if you move to a different port on the same switch?
I have tried this on my home lab (6.5 u3) and I do not see this behavior.
What network cards are in your host?
I should also advise I have seen identical behavior on 6.5.0 Update 2 (Build 10719125) on a ProLiant DL360 Gen10 with an identical single NIC (unteamed) configuration.
ok, multiple dumb question time
When it is working does the iLo show the network status as connected, up, something other than unknown?
Does the link light on your switch show that the port is up?
And you have checked the firmware/driver interop?
If I have got it right the link below should take you to the right page:
Did you ever try just moving port on the same switch?
OK - thank you for your help. As it turns out - the physical adapter is not compatible with the type of switch (Netgear GSxxxx) Seems both sites had identical series switches.. How bizarre.