Hi,
We have exactly the same issues as FloXXI, and I have double checked and we have not applied the NIC firmware updates to any of the affected servers. We have a number of G5, G6 and G7 affected by this, the only thing in commons seems to be they are running Windows Server 2008, as none of our 2012 boxes have been affected so.
The only way to fix these servers seems to fix these servers appears to be remove all the HP NIC drivers from the driver store, reboot and install the latest drivers.. Which seems to work in approx 80% of cases (For us anyway) but then we are getting random behavoirs (black screen of death & Non-P&P Drivers not starting) on the other 20%, so I;m not convinced that uninstall the NIC drivers is enough...
Phil