Hi, > Thanks, > > In the failed case the hub in the dock doesn't show any activity > on port4 where the NIC is connected. No changes, link isn't in any > error state. It looks just like any empty port. > > I don't have any idea what's going on. > > I guess it's not possible to connect a protocol analyzer between the > hub in the dock and the NIC? No, I'm afraid I don't have a protocol analyzer... Any other logs, etc. I could provide? Thanks and best regards, Christian