Hi Johannes, about this issue I have try to find an easy method to recreate and now I think I have found it: Use the ethtool and change the settings. Each usage of the ethtool to the FCoE used interfaces run into this problem. An example: eth2/eth3 are assign to FCoE ethtool -s eth2 autoneg off speed 100 duplex full and the problem occure Best regards Holger